Most of the time it was assumed that when he was out he was chasing down renegades. Either Resistance members or defected Death Eaters or even a stray random citizen or two who thought they didn't have to actually pay their exorbitant taxes. But honestly, no one really cared where he went or what he did as long as he was discreet. The Dark Lord and his Inner Circle rested easier when the younger Malfoy was away. Like her, it seemed that he was always running and moving from place to place. Unlike her, he had a large, comfortable home with two parents who were happy to open their house to him whenever he was near. Her parents were a part of her history better left undisturbed.