Cognitive and cultural embeddedness: combining institutional economics and economic sociology
According to this, pederasty is sexual relations between two males, especially when one of them is a minor. Other definitions, like the one that JSBangs found, differ slightly. But otherwise, I think you answered the question yourself: pedophile refers to the attraction, while pederasty refers to the act itself.
Definition of PEDERAST. : a man who desires or engages in sexual activity with a boy. â pedÂ·erÂ·asÂ·tic \Ëpe-dÉ-Ëras-tik\ adjective. â pedÂ·erÂ·asÂ·ty \Ëpe-dÉ-Ëras-tÄ\ noun. ADVERTISEMENT. a man who desires or engages in sexual activity with a boy.