Table 1 Different features and their corresponding groups

1

Advertisement language pattern

[6, 25, 26]

 Third person language

 First person plural pronouns

 Kolmogorov complexity

 n-grams (1)

 n-grams (2)

 n-grams (3)

2

Words and phrases of interest

[27,28,29]

3

Countries of interest

[3]

4

Multiple victims advertised

[6]

5

Victim weight

[2, 30]

6

Reference to website or spa massage therapy

[6]

 Reference to a website

 Reference to a spa massage therapy