I’ve experienced this page obscuring pop-up several times on the MacRumors site. I also experienced it on other sites using iPhone Safari, so I first created a thread asking for thoughts and advice in the iPhone tips forum. It appears other users have had a similar experience at MR, so it might be the ad network you guys are using. Just wanted to report it at this point.
I've seen it. Repeatedly. I end up closing the browser and re-openning it, and navigating to a different site, or using a different browser to open the page that causes that. It has kind of freaked me out every time I see it, because I wonder if it is the result of my device being compromised, or if someone of the programers responsible for Safari just screwed up and put/left code in Safari that allows this to happen. I'll tell you though, one thing I have never done and will never do, and that is touch ANYTHING on that page when it does appear.
Anything. As far as I'm concerned, that's malware or a malware serving site. It's obviously fraudulent, since they have no way of knowing whether or not I'm an Amazon user, so the pop-up is clearly BS.
After the second or third time I saw it, I started to look around and try to find if there is a "hosts" file on an iOS device, and to try to figure out how to block the DNS or IP address or both, but the iPad (what I was using at the time,) not being a real goddamned computer, (despite Apple pretending it is,) I could not find a way to edit the hosts file, that didn't involve having to "jailbreak" the device, or use a proxy or VPN external to it, (which I'm not sure would even work on a device connecting to the internet through the cellphone modem, (rather than through the WiFi).
To combat this, I use a better browser than Safari for most websurfing now, since the way I figure it, the fact that this window keeps randomly popping up is a sure sign that Safari is not good enough for general browsing use.
I now use Firefox and DuckDuckGo's browser, only using Safari for certain specific things.
Before long, I plan to dump all my Apple stuff and buy a real computer again, and be done with Apple. Their quality has gone utterly to hell, and I suspect they're actually in-league with whoever is responsible for the "Congratulations Amazon User" BS, since they are also an advertising BS platform. (See "iAds".)
But no, you're not the only one to see these things.