For three pennies an hour, hackers can rent Amazon.com Inc.’s servers to wage cyber attacks such as the one that crippled Sony Corp.’s PlayStation Network and led to the second-largest online data breach in U.S. history. A hacker used Amazon’s Elastic Computer Cloud, or EC2, service to attack Sony’s online entertainment systems last month, a person with knowledge of the matter said May 13. The intruder, who used a bogus name to set up an account that’s now disabled, didn’t hack into Amazon’s servers, the person said.