Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39debe8f95e8735…

MALICIOUS

PDF

47.2 KB Created: 2020-09-01 00:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf5c16633aeeae1672caca7366712781 SHA-1: 552434c0865410a355835f3ba3d4ddad849db635 SHA-256: a39debe8f95e8735a52fa0d4e22899d206ada3750bec77a4fcf7a3ebe0b667de
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One of these links, 'https://ttraff.ru/wix?keyword=keenan+allen+injury+report', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files, suggesting a link farm or SEO poisoning tactic to lure users to malicious content. 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.ru/wix?keyword=keenan+allen+injury+report
    • https://cdn.shopify.com/s/files/1/0432/5897/0280/files/action_research_in_classroom_discipline.pdf
    • https://cdn.shopify.com/s/files/1/0447/1272/2585/files/intel_assembly_language.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5055/files/pabidaratuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/josuzafegeda.pdf
    • https://cdn.shopify.com/s/files/1/0461/8836/3929/files/blur_image_background_dslr_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/antihistaminicos_2017.pdf
    • https://static.usrfiles.com/ugd/edb4a7_452e0743dc7e494685af979009937784.pdf
    • https://static.usrfiles.com/ugd/e8506d_f046939456a84feab76696d049a1be09.pdf
    • https://static.usrfiles.com/ugd/a43ec6_d397ec995861434d84bbc9df43c5cff8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e23a41186604fdda221f1467e8a191e.pdf
    • https://static.usrfiles.com/ugd/8b97dd_b6cc772a80324a0cb9358a8cb6e416ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc0c4db397c340528d5172c59936b4ea.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_off00007b58.bin
e9d21672935dca8ee9c4d9e1f1e16259391f6ce27de5028e12199ca5895b0483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B58 4784 bytes
font_01_sfnt_off00008bbe.bin
7e98efd3d516b5d36b38bdd83be239e4eba9cb06178390687137919419ca7d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBE 10708 bytes

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