Malicious PDF — malware analysis report

Static analysis result for SHA-256 40639a6fca8c22ef…

MALICIOUS

PDF

54.3 KB Created: 2020-09-05 07:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa5851387b8b8170a886822cb3e80016 SHA-1: 6bf1df029590116d7c458d5d7f45ea5d699ae904 SHA-256: 40639a6fca8c22ef2bbeaae9df312bf93d421f76839c5e4052a1c352729d64cd
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 'ttraff.me'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to external PDFs hosted on platforms like Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains the same malicious URL and a reference to a song title, suggesting a lure. No scripts were extracted from this sample.

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=chamma+chamma+3gp+video+song++tinyjuke
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/jupuwugipumezitas.pdf
    • https://cdn.shopify.com/s/files/1/0444/5673/8983/files/27853510175.pdf
    • https://cdn.shopify.com/s/files/1/0459/9175/5938/files/corona_kerosene_heater_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/biology_vocabulary_list_with_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1702/files/gelodowapufumulal.pdf
    • https://static.usrfiles.com/ugd/b916f4_858323405b3d4660883ecdace2926eeb.pdf
    • https://static.usrfiles.com/ugd/b7306e_2658ec1034a04cc483e37b332937ab58.pdf
    • https://static.usrfiles.com/ugd/e1d58f_0b5a9c0e5c564827a2f4e5637473091a.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/63820796392.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/jezewijufesawubegikodunal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000757a.bin
91439cbaf17061d49ed3e76ab0ce02c763eb3a28e3cb2aa4e0bcbc66a6a68339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757A 5732 bytes
font_01_sfnt_off000088e4.bin
1173dec157675422101615ab020957ac359de5f60a6585bef72fb567b859c437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E4 15968 bytes
font_02_sfnt_off0000baa7.bin
79c41a80d07100b38f06dc5eed3602ebf0bce5d3e8846589fda1194fc411d9c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA7 4736 bytes

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