Twenty-two-year-old Christopher Sudlik also was sentenced in federal court Wednesday to three years probation and 60 hours of community service.
Sudlik previously pleaded guilty to participating along with members of the online hacker group Anonymous in attacking the Angel Soft bathroom tissue website in February and March 2011.
Angel Soft is a subsidiary of Koch, the intended target of the attack.
U.S. Attorney James Santelle says Sudlik and others tried to flood the Angel Soft server, based in Green Bay, with traffic to disrupt the website's service.
Koch lost several hundred thousand dollars as a result of the continuous attacks on several of its network servers over three days.