Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f621f09d43a101…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 11:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba4316d070b61366348a03fd40d268f0 SHA-1: c37cc11f66336608742e5565699595451a196fc8 SHA-256: d9f621f09d43a1017d8cf2bbec42d3220201d44ab36130856cd6584f8d523eba
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cambium+cnmatrix+datasheet, which likely serves as a gateway to further malicious content. The document body, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims.

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=cambium+cnmatrix+datasheet
    • http://fepuwijo.auroramay.ca/uploads/1/3/1/3/131379685/117c8b97.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/tuwigu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/rukugonixefesudupedavinov.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/95460090346.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/lowaxivenek.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/8633212753.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7554/files/33165462953.pdf
    • https://cdn.shopify.com/s/files/1/0440/3144/3094/files/temim.pdf
    • https://cdn.shopify.com/s/files/1/0437/9341/6349/files/sopedifufovej.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/gefediwosamovavegaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/zivawa.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_off00006116.bin
5e53f92e796aa7273b688e6fcaae5df8b6ec22cdcfa5071561e62e117a077bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 5260 bytes
font_01_sfnt_off000072c3.bin
3d1c6bb4dafcb9176d3a8779369bb42cfc530afbbc2113e2afad4d594a4c4361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C3 15636 bytes

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