Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4c3a6683d28b9c…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 01:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3940099f222efb93c1e4aac42701667 SHA-1: c9e72e9f1c774bed6aa0682a875b1b08e8ebc705 SHA-256: 7b4c3a6683d28b9c0b775fa1beae5027bfb3aadcfe91c49bb72748a3a712e7b1
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious due to a critical heuristic firing for a malicious redirector link. The document body contains the URL https://ttraff.com/wix?keyword=fiche+revision+module+6+aide+soignante, which is likely used to redirect users to a malicious site. Additionally, the PDF contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to distribute malicious content.

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=fiche+revision+module+6+aide+soignante
    • https://static.usrfiles.com/ugd/b8c837_2bec52530e3245368dd8b5539a8d1336.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abb086997794cdb867f6fd60c66575f.pdf
    • https://static.usrfiles.com/ugd/3f80ec_edd25a9c169e4ac6bae27e8bc280cc50.pdf
    • https://static.usrfiles.com/ugd/0047a4_3638918b897f434dbd6cd8e549d55057.pdf
    • https://static.usrfiles.com/ugd/286fb8_68cad7eb733f4df79759da4faee03a9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bd99d3ec05547a7aba335eb1806337a.pdf
    • https://static.usrfiles.com/ugd/3e87bf_0b1e7f445e394edc9015f74739d14d31.pdf
    • https://static.usrfiles.com/ugd/b8c837_41739e46bade405d8169c1762424a5e1.pdf
    • https://static.usrfiles.com/ugd/6df952_cd23896d4ac840ad8003809b26970a6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_25ce794ea87541828f2e8ce8877a5f8f.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/botelexoxaf.pdf
    • https://cdn.shopify.com/s/files/1/0452/3150/5565/files/90437833933.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_off00005d3a.bin
6c564e063ce8361e2860c7cc714f9d31afc20de767ca104102feb86dbaea4b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3A 5520 bytes
font_01_sfnt_off00006fd4.bin
4936fd584e7848c163396ba08acefac41cc709997a1f292859ac226adfb1c9ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD4 12216 bytes

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