Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d1b7f23ba9af99…

MALICIOUS

PDF

38.3 KB Created: 2020-08-21 02:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7929ebce6b6ff8c2385cf694e7c53c5c SHA-1: ac007439178228804d3e8fcc93886d1d19ca7f49 SHA-256: 81d1b7f23ba9af99dd0b3fd913568e9956f50fb7c8feeff6a96f6da2b0808045
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of multiple PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious destination. The file was generated by wkhtmltopdf, a tool often used to create documents for SEO spam campaigns.

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=ladies+in+lavender+sheet+music+cello
    • http://files.earforlanguage.com/uploads/1/3/1/4/131406977/jizagojosesibev.pdf
    • http://files.attentivesafety.com/uploads/1/3/1/4/131408056/lamidilipukatuborasa.pdf
    • http://files.laurawritingcoach.com/uploads/1/3/2/8/132814463/1498812.pdf
    • http://files.jimsv8vair.net/uploads/1/3/1/4/131438313/bonijolosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/84697093743.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/vajasekevevosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/12673439574.pdf
    • https://cdn.shopify.com/s/files/1/0461/9675/2534/files/87716919347.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0450/8984/9509/files/big_data_analytics_made_easy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/jewatifini.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1195/files/vomuzomogopojikunez.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/jasajuraziwo.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_off00004aec.bin
2367915ee5a11e52d4f6536fe21cfdac69bde735e23940d1ae46e909b11d7706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEC 5064 bytes
font_01_sfnt_off00005bea.bin
588c5837daf8f21439db7ac023b8ac2207b14475b1c022533f164bb224a412b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEA 10088 bytes
font_02_sfnt_off00007e64.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E64 4324 bytes

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