Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2969ca17c8def7a…

MALICIOUS

PDF

84.1 KB Created: 2020-09-17 04:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9918ff4bae7d60fbad04980c14c3bd2b SHA-1: 8025f4f63d0023c89559b2e04ea33d0770fc9ae5 SHA-256: b2969ca17c8def7a023f1397e0ca768669f02f93644f46713078139389f0e375
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/pify?keyword=for+the+binomial+distribution', which is also listed as a malicious redirector. The presence of numerous external PDF links suggests a link farm or redirection strategy.

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.link/pify?keyword=for+the+binomial+distribution
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6629/files/restrictive_trade_practices_act_1969.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/nopirim.pdf
    • https://cad9944a-05bb-4b7a-a427-0a71f65a1a12.filesusr.com/ugd/5926b4_eebebc3229b4444cbb688f0e6c297e4e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/7497842503.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/nedexuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/72460207500.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/91592891696.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaxesajikibulunetegidu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/kinijoxamipenulopil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e252.bin
435f08fef51a65b6bff7f0d30c45a859aff643601ceefed1e93ce6ee22f78a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 5160 bytes
font_01_sfnt_off0000f3ac.bin
6b98f93104b29c530b1585ee042820103da5d3ffc4cbfc576b9ad01d7f318039		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 17936 bytes
font_02_sfnt_off00012b8b.bin
f8b1372c9001ea4f93fc7ff803abfaa20bb726958c34af297bf84db9ef41ae16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16828 bytes

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