Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9afb9d1b6d6381a…

MALICIOUS

PDF

39.0 KB Created: 2020-08-01 20:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bb21c353b32417a5e2660122e0ab8a7 SHA-1: dfe3f820ada8ae3e80ad1424e152547f7e63dac9 SHA-256: c9afb9d1b6d6381aec4114e6fa4d821611805d68dc7c0c87b3ec7228aa7d1245
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=signal+processing+first+mclellan+pdf'. The document body, though heavily obfuscated, also contains this URL and other links hosted on cdn.shopify.com and various other domains. The primary attack pattern is likely to lure users into clicking these links, leading to potentially malicious sites.

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=signal+processing+first+mclellan+pdf
    • http://files.coachsteele.tech/uploads/1/3/0/7/130739918/dosugidosasuxusepi.pdf
    • http://files.optionsmississauga.com/uploads/1/3/0/8/130813317/82f128e66011dda.pdf
    • http://files.hawaiistylecheer.com/uploads/1/3/1/3/131379014/judadebinetuzi-zotedusemuku-ziwusonevedaxen.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/xegema.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/jofemewujawalobaxari.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25843483079.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/limegakulasigakodasoziju.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/19091195782.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/riditebeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/nafevavijapulaxopopu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/10166571485.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/19667363652.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/64874285472.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/30777144363.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/87851087279.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_off00005623.bin
12c798bb0348968d4812a5ae70fbe58b74f7aa8eb91ee849f3463e49b85f5aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5623 5580 bytes
font_01_sfnt_off0000690d.bin
c0bba6b0c99259665ef444b2ddc4b264e57d0e16889734f432cb93261e3fca6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690D 10752 bytes

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