Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b85d6325c8f46e…

MALICIOUS

PDF

44.5 KB Created: 2020-07-25 16:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b7d80df8690ffe0b048578431182b4e SHA-1: 082025cbd1aa2494b3e0914917b2fc27a159626d SHA-256: 51b85d6325c8f46e4707ffb96b201f05f7d17ec6b522cdca47f31b5ebe537fea
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. One of the primary links points to 'ttraff.com', a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO manipulation or to host malicious links. The presence of a link farm heuristic further supports the malicious intent of distributing links.

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/pify?keyword=capitulo+1b+vocabulary+check+sheet+1
    • http://files.chivertonrda.co.uk/uploads/1/3/1/4/131483009/6003388.pdf
    • http://files.defy-foundation.org/uploads/1/3/1/4/131483097/fidunaxuvepifedim.pdf
    • http://files.centralhauling.com/uploads/1/3/1/4/131409098/porek.pdf
    • http://files.janaheartsdesign.com/uploads/1/3/2/7/132740987/4142351.pdf
    • https://cdn.shopify.com/s/files/1/0438/2231/7728/files/53475919232.pdf
    • https://cdn.shopify.com/s/files/1/0435/0191/2224/files/4282717350.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/nojujesuxopidejeluko.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/31773564672.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44758106853.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/36815586110.pdf
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/foninosak.pdf
    • https://cdn.shopify.com/s/files/1/0434/4066/8838/files/84664758764.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/nokapukapunafevabeteta.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/tatofilaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0832/6812/files/leninokakenisadojexixoru.pdf
    • https://cdn.shopify.com/s/files/1/0438/3522/8317/files/sugazavezofutosodadesusez.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_off00006d5b.bin
7900fa769defbdf67c6909ecbe7bbf73dbc6d5def6b5d87912f6adbb8e8b1db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5B 5240 bytes
font_01_sfnt_off00007f53.bin
e6f8687bb3849de54cf7058792cf6ba60a158975995e1af65c2a79670350a7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F53 11052 bytes

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