Flooding requests to dynamic URLS such as captchas and asking them to pay Ransom:
http://www.deepdotweb.com/wp-content/uploads/2015/05/screenshot.png
The Admin of TheRealDeal market provided some information about the attack:
http://www.deepdotweb.com/2015/05/11/this-is-the-ransom-ddos-that-is-hitting-the-dark-net-markets/
Sorry for the annoying Cloudflare but the attacker did not like the fact i posted this and is attacking me, and i have no plans to waste my time on petty attacks
Seems like a good strategy would be to wait until someone else is DDOSing the market, then flood it with simple GETs requesting ransom. Let someone else do the hard work and then you just collect.