Sounds like the feds are playing a strange prank. From HN:

This is surely the weirdest governmental communication ever. I'm fascinated by the idea that someone had to tell the NSC and White House, "NSA wants to rickroll the Russian government using DoJ-owned bitcoins seized from a dark web drugs-and-assassinations forum." Evidently our branch of the multiverse is a pasteup being collaboratively written by Grant Morrison, Charlie Stross and Neal Stephenson.

In any event, the WaPo thinks the NSA hack is legit.