There are a growing number of dubious "law offices" who send C & D letters for unsubstantiated/unproven/bull**** piracy claims in hope of getting every greedy law student's dream,
THE CA$H $ETTLEMENT
I'm guessing they've stopped easily wringing the dollars from grannies who know nothing about bittorrent, and are moving on to target Android enthusiasts on "copyright infringement" claims.
If you search torrentfreak or any other torrent-related news site, you'll see plenty of items about law firms harassing innocent individuals, sometimes without the benefit of even being hired by the alleged plaintiff of the suit.
Sure looks to be what's happening here.
That said, larger law firms DO shop routine work out to smaller, associated firms now and then. Seeing an attorney in the appropriate field who will give you a free consult will only cost you time. Contacting the EFF would also likely put you in touch with several people eager to hop all over this.