I'm getting incredible bored of this situation.
2 different friends phone got infected with some kind of ads-malware that open internet page at random while navigating with news, shopping and google fake searchbar.
I've joked they for weeks for let getting this 'malware' (nb: undetected by all antimalware apps that I know) installed on their phone (nb: different models, different carrier, no root, never connected to the same wifi. Basically never encounted). They simply download app from playstore, do web browsing and using whatsapp and telegram... They use in a 'casual' way their phone and they seriusly don't know what they are done wrong...
Today I've got a similar problem and I seriously don't know what I've done, cause I didn't have installed any app since several months, didn't used anything aside chat app and gone through the same 3-4 website I check usually.
What's the problem?: every time I open a browser (whatever it is, chrome or firefox) it try to open a page full of spam and sh1t. If I press HOME button and reopen again the browser I got another tab with the same page... And so on: if I tap 10 times on chrome or firefox app icon it will open 10 tabs that redirect on that crap site.
The deal is that I usually use firefox with adblock and ghostery and it's strange that I got infected with something.
I've not installed nothing strange, and nothing at all since 2 months ago. I didn't done any app update since...ever. I'm using 5.1. I think maybe I got something surfing the web, but I can't discover what or HOW I got screwed.
Also I can't get rid of this, tried everything I know: cleared ads ID, cleared cache and checked dns and....nothing.
How can Android be such insecure? How can I understand what's causing it? Any ideas?