Malicious PDF — malware analysis report

Static analysis result for SHA-256 409610ec64d8e566…

MALICIOUS

PDF

37.9 KB Created: 2020-08-05 00:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d25d28ef57b982f4456fc664148066 SHA-1: 9b47bb0e81183a3c47fc759f0bacf8bd8e4e1ef7 SHA-256: 409610ec64d8e566ad0d34b7db1a58a4cb1b69adfb468a142ae74e134906f830
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, 'https://ttraff.ru/pify?keyword=autism+fact+sheet+pdf+uk', which is disguised as a legitimate document. The ML classifier strongly indicated maliciousness. The document body text, though garbled, contains the same lure text, reinforcing the social engineering aspect.

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.ru/pify?keyword=autism+fact+sheet+pdf+uk
    • http://files.aspiretogetherforum.org/uploads/1/3/1/4/131482975/6485956.pdf
    • http://files.romanodacosta.com/uploads/1/3/1/4/131454696/c239b1a507.pdf
    • http://files.burrataandchardonnay.com/uploads/1/3/1/4/131483067/2563743.pdf
    • http://files.portlandpipes.com/uploads/1/3/1/0/131069869/nolaf-jarulos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/jogefagekepofozawu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6074/files/11511156980.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0829/files/3826388121.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/76101797491.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2821/files/53840998506.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/76140162078.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6127/8870/files/megofivixanulon.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9848/files/58806308382.pdf
    • https://cdn.shopify.com/s/files/1/0440/7656/4630/files/dixofajegani.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/nakexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/jibivinakabamuda.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/95841101473.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/12092322719.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_off00005773.bin
54201055af1649da8a962261e97a1785030c5c7cd58e8790f146d07afead51ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5773 5320 bytes
font_01_sfnt_off0000696b.bin
4c42a3cc8024810a878148c0aa5c39296ed09dbcbd75c2568a1594516dae80bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696B 9708 bytes

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