Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5c8a181074df5a…

MALICIOUS

PDF

50.3 KB Created: 2020-08-21 01:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a741c219aaf545f07a7c9686d32a41da SHA-1: ef5ed527351641dc2f0e48a42d74b81c3d67a919 SHA-256: 8f5c8a181074df5afdd50b893317a087e212f64e9c19ae0a47ebeafb08bca5b3
150 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL identified is https://ttraff.ru/pify?keyword=work+instructions+document+template. The document body, though heavily obfuscated, contains this URL and other benign-looking Shopify URLs, suggesting a lure to disguise the malicious redirection. The ML classifier also strongly flagged this PDF as malicious.

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=work+instructions+document+template
    • http://files.b-wellnow.net/uploads/1/3/1/6/131606335/padadominavilokitewa.pdf
    • http://files.masleonphotography.com/uploads/1/3/0/9/130969825/lamado.pdf
    • http://files.newzion-clearwater.org/uploads/1/3/0/7/130776368/kofovawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/71311225875.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/8620699645.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7254/files/pathway_aterosklerosis.pdf
    • https://cdn.shopify.com/s/files/1/0440/0106/7166/files/moxoluvokepitemo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/sutoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7590/files/judijopu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4567/5420/files/64114075221.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/demamolurifafeforeta.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8498/files/33091377611.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/definicion_de_anexos.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_off00008739.bin
924b5dfcb1fa6ad2e0164c55e0a4f17bc953c827d736e4a59ec4df21d01e0adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8739 5296 bytes
font_01_sfnt_off0000992b.bin
ab9089fddf2dd0964507de8c8f2aa17003f98f0fdac4439f198a9ad885179035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x992B 10244 bytes

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