A lawyer representing Sony Pictures Entertainment Monday asked Twitter Inc. TWTR, -0.62% to suspend the account of a user who posted more than 50 internal company documents released by hackers as part of a massive cyberattack on the studio.

The letter to Twitter, sent by well-known attorney David Boies, is similar to ones Boies sent to news organizations last week on behalf of Sony Corp.’s SNE, -0.87% entertainment unit.