Hey, I'm a lurker but made an account just to report this issue. I was surfing through ML on my phone (Samsung Galaxy S5) and got redirected to an ad page, which has happened a few times in three last week or 2. This time though it popped up saying my android needed an update. I couldn't close out of it. Then it changed into an ad for Porn Droid (seriously, that's what it was called!) And then it downloaded Porn Droid onto my phone. Twice. Without me ever clicking "ok."
I think (fingers crossed) i got it deleted. Here's the info of what downloaded:
Pornvideo.apk and below that it said maevrtuiml.girlaz.net
Also, I was viewing the mobile website, not on the app or anything.
Hope that helps you figure out where the problem is coming from. I tried to screenshot but this is a new phone and I don't know how to do it here yet.