We currently have a specific situation on our website. We are a portal which serves ads, mostly via google network.
Some of our users have started to complain that they are experiencing popups and redirects. Popup is mostly related to some jackpots or free amazon 1000$ gift cart.
I have tried to fake geolocaion and IP address myself, but i never had any problems with it.
A lot of users which report this activity, states that they only have issues on our domain.
This issue only happens to users out of our country. What are the best ways to analyze problems like this. This sounds like some malware or faulty ad campaign, but I must be sure, and I can't reproduce issue to trace it.