Each person has been fined VND400,000 (US$16.37) for "disturbing public order," Ben Nghe Ward police in District 1 announced Tuesday.
On Nov. 1, a 38-year-old who drove the hearse was fined VND700,000 for violating a government decree on keeping vehicle doors closed while driving them.
The group of eight hired the driver to take them from District 7 to District 1 in a hearse.
The passengers dressed like "ghosts" for Halloween night.
When they reached the Nguyen Hue pedestrian square, where many Halloween revelers had gathered, the driver opened the door for his passengers to cheer and "scare" others.
They stopped the hearse in the middle of the street and the passengers took out a stretcher pretending to seek medical attention for an injured person.
Their performance attracted a crowd.
Halloween has become increasingly popular among young people in Vietnam over the last decade.