Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b87b99d18d2c3f2…

MALICIOUS

PDF

67.1 KB Created: 2020-11-06 09:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59fdef3dd68c109d69972397b0d79f9d SHA-1: b0ccb977486e1646d3e26cfa5298e3a87e6438a6 SHA-256: 9b87b99d18d2c3f29a4c29a6a79a472b70319f6cc9f5a063297bd6e0f4c27e43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users searching for specific content. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests SEO poisoning tactics to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://traffmen.ru/123?keyword=edith+hamilton+mythology+online+pdf
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f8f315078a19.pdf
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f895f011d4bc.pdf
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/witowuje_fumegafukusat.pdf
    • https://cdn-cms.f-static.net/uploads/4467573/normal_5fa3bfcb4538b.pdf
    • https://cdn-cms.f-static.net/uploads/4403688/normal_5f9b78a03e710.pdf
    • https://pojozuwowate.weebly.com/uploads/1/3/4/6/134631913/51e473ef48176.pdf
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f98cd9608c17.pdf
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f91f4d62cbfc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rimepusox/ocular_migraine_aura.pdf
    • https://s3.amazonaws.com/henghuili-files/pefava.pdf
    • https://s3.amazonaws.com/firigugixujotov/honeywell_lynxr_user_manual.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000952c.bin
1ce0659697b3e921b0e2a0760126135a67885b4a1bd33f91c61b05bf2bc0544f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952C 5028 bytes
font_01_sfnt_off0000a62e.bin
dbd32d941e56acf7205a8efd316bef7c267e94e5f06036ff03b1ead0a089098c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA62E 3552 bytes
font_02_sfnt_off0000b4d5.bin
8e5322cc16c7e0dd0d7a006299442b60725b1d16ee685a7be99dbfd59ee85eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D5 11236 bytes
font_03_sfnt_off0000db1c.bin
794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 16168 bytes
font_04_sfnt_off0000f022.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 4324 bytes

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