Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22f1dca663f4095…

MALICIOUS

PDF

41.0 KB Created: 2020-08-03 14:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9729defc667f9ca417ed1aa6fe78cd16 SHA-1: 6c0166a3de9286ae9ff1ceff20896b33124219e0 SHA-256: e22f1dca663f4095b073b0b38d5e8fd1809beeafe0a6b49ede49bb091e2fb875
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to Shopify-hosted PDFs, suggesting an SEO link farm or content stuffing tactic. One prominent link, 'https://ttraff.cc/wb?keyword=hipotiroidismo%20pdf%20tratamiento', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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.cc/wb?keyword=hipotiroidismo%20pdf%20tratamiento
    • http://files.bnativeflutes.com/uploads/1/3/0/8/130814716/1472531.pdf
    • http://files.merkconstruction.com/uploads/1/3/1/3/131381109/zijobiv.pdf
    • http://files.iamlovedministry.com/uploads/1/3/1/8/131856288/mumono.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/ketekinuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/90407038929.pdf
    • https://cdn.shopify.com/s/files/1/0436/0568/8483/files/22881467859.pdf
    • https://cdn.shopify.com/s/files/1/0434/8700/2790/files/70172204130.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/43842938316.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/68134098727.pdf
    • https://cdn.shopify.com/s/files/1/0440/5808/3480/files/kokitovitimuzafuzowemub.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7966/files/27534224281.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/alt_code_for_pi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/wexifanagavakififolotivil.pdf
    • https://cdn.shopify.com/s/files/1/0435/6128/7839/files/rosewonaputedakubevefe.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_off00006005.bin
95d4a9b47719777713f32140930d272ad537cb3443c3b5b4ed2cf18bf58e4763		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6005 5116 bytes
font_01_sfnt_off00007153.bin
166d0340bfdf6fb6bc8af8f8750f499503c462765584f14e3686045576c4ffb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 11204 bytes

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