A mechanism in which real gravitons form an aggregated body owing to a nonperturbative quantum gravitational effect was proposed in a previous study. Dark matter exhibits characteristic behaviors that remain difficult to account for within existing Standard Model (SM) frameworks. We show that these behaviors arise naturally from this graviton aggregate without introducing new fundamental particles beyond the SM and the graviton, or invoking hidden forces. Under reasonable theoretical economy, physical arguments then leave this aggregate as the only consistent possibility. These analyses identify the graviton aggregate as a viable dark matter candidate.