PDF malware analysis — malicious · b6e1f7f8eb8d72b3

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 15:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 98355b5e1013512d247e78e96079f5ed SHA-1: 902f4bc32d9981cdda833c5f6542fb988733896f SHA-256: b6e1f7f8eb8d72b3583abcadfecbf8c34d8c08a48cea0a7018c5085a380d3e9b

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to a game. The document body, though heavily obfuscated, also contains this URL and references to 'wkhtmltopdf', suggesting it was generated programmatically. The presence of numerous external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve SEO for the malicious redirector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.com/wix?keyword=hungry+shark+world+skins
- https://static.usrfiles.com/ugd/e3c460_cc0bdfa898eb449ea1f20eb13307824a.pdf
- https://static.usrfiles.com/ugd/b8c837_c9e49ccab4d2473b92c51524267b7cea.pdf
- https://static.usrfiles.com/ugd/5ecadc_249ab3da3dee48878b44c2585ddd9aa6.pdf
- https://static.usrfiles.com/ugd/b8c837_f47e6561fc184c4ead6c241b649ad407.pdf
- https://static.usrfiles.com/ugd/6116da_8c58fd35aa2742e9807082a0136cb2ac.pdf
- https://static.usrfiles.com/ugd/5d2cf3_bfd44bfc2eda4263ae3fad7df4c0971b.pdf
- https://static.usrfiles.com/ugd/b8c837_da91eb6cea424e249b9b5cf871653045.pdf
- https://static.usrfiles.com/ugd/99965f_3fc32f3639ff4ddca85b2c1486a55a9c.pdf
- https://static.usrfiles.com/ugd/b972d5_6f7fa017f11a4ff4adc259ad1535a0f4.pdf
- https://static.usrfiles.com/ugd/b8c837_d08a0134108a41e787762ba4e8b11739.pdf
- https://static.usrfiles.com/ugd/18f527_904929887c6a4bb49766663b880a9df8.pdf
- https://static.usrfiles.com/ugd/7ea8bb_a3d9bec47845435ead0bdf06d8b4f872.pdf
- https://static.usrfiles.com/ugd/b8c837_64a5360b754243ffa1bec505528476f8.pdf
- https://static.usrfiles.com/ugd/9d869b_8158c8bbb3a545c794f96abacf09db77.pdf
- https://static.usrfiles.com/ugd/5d2cf3_9cb55fe3e9ae4b11b076a575fec78771.pdf
- https://static.usrfiles.com/ugd/e3ff21_7105284538b649dca2ebe7b50126e4f5.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006d67.bin` `5192fed50b22ff39f13c80123e376e76448ca1385ea3f24c67184045ed988064`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D67	5308 bytes
`font_01_sfnt_off00007f84.bin` `8ab976a8bf31d6512a5bfa46b6b774370040ab2088143558c12ece99204d36cb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7F84	11072 bytes

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