首楞嚴義疏注經 8.462

8.462

此即貪習為因也。於物生貪，非理而取，餘報在鬼，還托於物，即金銀、草木精怪，其類非一，故名怪鬼。正受苦報在寒氷獄。

This is the habit of greed as the cause. Producing greed for material objects and taking them unlawfully, their remaining retribution is among ghosts, where they still attach to objects: namely, spirits and goblins of gold, silver, grass, and trees, whose kinds are not just one; hence they are called "freakish ghosts." Their primary suffering retribution was in the Cold Ice Hell.