Guess Types of Invalid Traffic

12345678
Across
  1. 2. Big machines sending traffic
  2. 4. I am not who i say
  3. 5. You cant see, but recorded an impression
  4. 8. From where did you come from
Down
  1. 1. Which surprises you and appears
  2. 3. On top of each other
  3. 6. Dont take whats not yours
  4. 7. Too many times in a day