Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5758d08aa7bc908…

MALICIOUS

PDF

95.5 KB Created: 2020-09-07 08:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c203b63c42b77ffe2e149016f9243784 SHA-1: 0e344e75d6c8e15ac8fa58610b826628b2a433ad SHA-256: d5758d08aa7bc908f7e1a8fd87a4178b6440aec3468b5bfd72da163fc5ba6eac
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=acne+vulgaris+pdf'. This URL is presented within the document body, suggesting a social engineering attempt to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious URL is sufficient evidence for the attack pattern.

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.me/wix?keyword=acne+vulgaris+pdf
    • https://static.usrfiles.com/ugd/12f4eb_b4a8a9907bc442248b8d27a269812867.pdf
    • https://static.usrfiles.com/ugd/cc14e4_8cffd29b06214f42b898a1044f70c652.pdf
    • https://static.usrfiles.com/ugd/a4d998_3bdc14b11aa447c1bd4388b2ffcb17b7.pdf
    • https://static.usrfiles.com/ugd/15cd4d_22a28b652c6547349da38488498deba0.pdf
    • https://static.usrfiles.com/ugd/b47706_2b07ebac44f54e21a9ba1e3aab6e507f.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/17941141479.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/dungeon_master27s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/wopapokamezapireze.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4649/files/buganda_kingdom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/ziwewopafemused.pdf
    • https://static.usrfiles.com/ugd/9b33c5_8743e60596bc4eb7963a9f2364687bf0.pdf
    • https://static.usrfiles.com/ugd/0d002d_f947c2c649794b46a491de19836408a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_14dec97735fa48d18d97a2085a82bd09.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.

FilenameKindSourceSize
font_00_sfnt_off00012aab.bin
3c9f3914a7f527b113191b968c94f46e4f1210d84aac58b54ab55d7a57e9d4fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 5372 bytes
font_01_sfnt_off00013d0d.bin
c72d84a833bff2da564de0de769d7a4ee4f1e8b40a8f44a41f3246f355746c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 16944 bytes

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