It looks like its from LinkedIn, I would check your setting in that site.
DMS Partners | LinkedIn
Keep up with DMS Partners. See more information about DMS Partners, find and apply to jobs that match your skills, and connect with people to advance your career. ... Microsoft® and DMS Partners partner to deliver Dealer Management System for Microsoft® Dynamics AX™.
And this as well
How do I stop Safari from automatically opening downloads?
- Open Safari.
- Click Preferences.
- Under the General tab, uncheck the option Open “safe” files after downloading.
Judging by the filenames, the URLs and the apparent randomness, it comes from an ad network. It can be something not blocked, like a tracking script. Or an "acceptable" ad. Or one that's trying to circumvent ad blocking. Or one with a malware. Whatever, ad blocking isn't a precise science. Yeah, it should be.Not in this case. Post #6 AdBlock in use.