Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bb8f7c4b4a3937…

MALICIOUS

PDF

38.9 KB Created: 2020-09-06 14:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9de7b8eac8223ff1b01bc173ec205150 SHA-1: 1e04fba5eec3dd87e622074933e3a4792500fc7a SHA-256: d8bb8f7c4b4a3937f95ba604fb535565d4ebb1aff6c660b6c84641eb02f92d79
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains text related to 'trumpet sheet music' and the malicious URL, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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.club/wix?keyword=trumpet+sheet+music+star+spangled+banner
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/moruxalararupatiligeso.pdf
    • https://cdn.shopify.com/s/files/1/0446/6225/9865/files/public_liability_insurance_certificate_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5813/files/35994842977.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/nejopaxuwibipuxesezigixed.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/vigosatekudobexulef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/dofenedezifonezorol.pdf
    • https://cdn.shopify.com/s/files/1/0459/7897/6423/files/remember_the_titans_speeches.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9957/files/tool_sober_tales_from_the_darkside_songs.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/datedokituvaki.pdf
    • https://static.usrfiles.com/ugd/b8c837_749827de5268404b836fd0d1bf8d7952.pdf
    • https://static.usrfiles.com/ugd/05301a_39079a1400e3423290d60f9dabcb632b.pdf
    • https://static.usrfiles.com/ugd/857e61_e59fb0214e824a249ef54e38efdc1290.pdf
    • https://static.usrfiles.com/ugd/50c35f_650813a3e77e4c1c81cd06ab9d3d125c.pdf
    • https://static.usrfiles.com/ugd/bd5c68_f90670d722f94e17b2f3c399b82191d7.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_off00004c8b.bin
1fc820ef7930a5c472fc73b35dfeab7e3827aef4f6df6dc1fce4bf3acc88077b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8B 5576 bytes
font_01_sfnt_off00005f4a.bin
c3ca673af29f59a4366143bcfdd43bf07bacd3f3baf44d3b7ebdcb41137b9ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4A 14600 bytes

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