Malicious PDF — malware analysis report

Static analysis result for SHA-256 b986713f94f42199…

MALICIOUS

PDF

80.4 KB Created: 2020-08-17 16:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0447d1e7baf1c7ca619431c81699e4b SHA-1: 2741d5c0f28f867fc0e1d9ffe85146bfcfda02f1 SHA-256: b986713f94f421994e445382d648bdbd1e84938a99391f8152618290656230f2
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'pathogenicity of salmonella' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious content. The presence of a link farm heuristic indicates an attempt to artificially boost search engine ranking for the PDF, likely to attract unsuspecting users.

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=pathogenicity+of+salmonella+pdf
    • http://nidana.semocc.com/uploads/1/3/1/8/131872295/belelezafavatusuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5394/0887/files/lupox.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/french_to_english_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0438/5246/4293/files/bemuxuzobiwepuwuwiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3042/0384/files/44828922516.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/76811154567.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/lijavikuwoxowewekukij.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/dixiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/50992355309.pdf
    • https://cdn.shopify.com/s/files/1/0434/6403/2422/files/5209847388.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/pujedowedakivozeti.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_off0000fe70.bin
77fe75c73d4d541fd427ff7ef4bf919b981f164d091878f31c0477b797cbf141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 5576 bytes
font_01_sfnt_off0001114b.bin
6c852fa0bfeec8714dad17dcd5b0b99cedca069d2c89bf18e01b598156235cad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 10452 bytes

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