Just curious if you figured out the cause? I have an HTC One M7 with the same issue starting several weeks ago. No new apps downloaded in quite a while (though app updates are turned on), and all of my apps are from Google Play (no non-trusted sources). Randomly a new tab in my browser will fire up and go to droidresearchapp.info, which appears to start streaming an all-black video in an embedded player. The purpose of this appears to be nothing other than killing your data plan, as I got a nastygram from AT&T saying I had burned through 5GB in a few days (when I usually use maybe 1GB a month).
I did a complete factory reset and erased all data a few days ago. I then restored my settings from backup and re-installed the 40 or so apps I run. I had no problems until this morning, when Chrome popped up again and went to droidresearchapp.info while I had Spotify running while driving to work. Argh!
So now I'm looking at ANOTHER factory reset, with no clue what app this piece of cr@p malware is piggybacking on.
Thanks in advance!