Malicious PDF — malware analysis report

Static analysis result for SHA-256 3337666a91678e4c…

MALICIOUS

PDF

37.7 KB Created: 2020-09-02 10:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 985cbe0ab28f349337b37fcac79b869b SHA-1: 859bed9df209389d684ebfea699a8189deb58280 SHA-256: 3337666a91678e4c935e9d49ea9f5442f2ad6115fa277cf4544ff5f1c5bf5cae
150 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector disguised as free sheet music. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS classification strongly indicate malicious intent. The document body text, though partially corrupted, contains keywords related to sheet music, supporting the lure. The numerous embedded links to Shopify PDFs likely serve to obscure the malicious redirector by creating a link farm.

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.me/wix?keyword=beatles+let+it+be+sheet+music+free
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/nejenugutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9224/6685/files/sigesu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8293/8520/files/xezopisejuj.pdf
    • https://static.usrfiles.com/ugd/e1d12c_9c7be845b9e34dbb95cf354baf8e80fa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/53040151055.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/90678898647.pdf
    • https://cdn.shopify.com/s/files/1/0429/7654/2873/files/lifivifinabu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4536/2591/files/61723636654.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/vosubobonunizerimum.pdf
    • https://cdn.shopify.com/s/files/1/0461/9780/1111/files/dukakudibez.pdf
    • https://cdn.shopify.com/s/files/1/0431/9055/0679/files/vifumesupanakipa.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3061/files/categorical_syllogism_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/project_business_case_template_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/belogovewonidivedoteb.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_off00005452.bin
5ab089cd37a41538090b22a38d76246749eed2e2db918236ba5e5d5efc3957ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5452 5308 bytes
font_01_sfnt_off00006636.bin
c3b02316873b1f22cdad4de58338519e37e8d72e7c2dee21390b086053255518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6636 10480 bytes

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