Well... I can tell you this much. It's a legitimate Target Coupon. If you want my opinion, I think someone received a paper coupon, and re-created it into a mobile Q. At the very least, Target may actually get reimbursed for it.
If it starts with 9856, It's a Target issued Store Coupon. Anything that starts with a 5 or 8110, is a Manufacturer Q and should NEVER, EVER, EVER be accepted from a Mobile Device.