Block the following IP addresses in your PPC campaigns as fraudulent traffic tend to come from these IP addresses: 

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104.209.188.*
104.45.18.*
107.191.33.*
13.76.241.*
157.55.39.*
174.44.107.*
174.74.45.*
178.79.138.*
198.50.152.*
204.79.180.*
207.173.123.*
207.46.13.*
23.101.61.*
23.99.101.*
40.77.167.*
40.78.146.*
52.90.145.*
65.153.162.*
67.162.190.*
144.76.8.*
209.126.127.*
209.133.197.*
23.254.167.*
5.9.62.*
51.254.97.*
62.210.170.*
107.202.189.*
108.61.202.*
151.226.189.*
69.30.198.*
69.30.215.*
69.30.234.*
172.2.59.*
99.49.193.*
77.102.157.*
166.137.118.*
166.137.126.*
166.137.136.*
205.197.242.*
125.253.32.*
216.4.56.*
192.169.227.*
66.249.73.*
37.220.6.*
69.30.211.*
69.50.186.*
65.54.247.*
131.253.35.*
192.95.56.*
107.77.92.*
192.243.108.*
216.155.145.*
192.227.237.*
162.208.11.*
162.254.149.*
100.42.245.*
142.4.204.*
68.146.80.*
70.75.245.*
70.78.50.*
107.131.117.*
107.203.106.*