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This is likely just a SPAMware type of site.

How to Delete Pixel.mathtag.com Pop Up from PC: 5 Steps

https://better.fyi/trackers/mathtag.com/

Likely your web sites got caught up in a spammers list. Try and look at your referring URLs to make sure the links are indeed not deliberately being sent from a 3rd party ad buy your company may have done(not likely). Once you verify that I recommend you have your IT department block traffic from that domain.

good luck