Malicious PDF — malware analysis report

Static analysis result for SHA-256 2196a8d3a13fd13f…

MALICIOUS

PDF

40.1 KB Created: 2020-08-16 02:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b69abae323c0227d2ae6a458aafb3e8c SHA-1: baa38eefd473680daaf22fb1a695478db588a1a8 SHA-256: 2196a8d3a13fd13f89c8f537801562dc7bd6516ffce2098067c485aa8340f670
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary link directs to 'ttraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains the same search query as the malicious link, suggesting a lure to trick users into clicking the link. The presence of numerous Shopify-hosted PDF links, while mostly benign, appears to be part of a link farm strategy to improve search engine ranking for the malicious content.

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/wb?keyword=ccd%20vs%20cmos%20pdf
    • http://nogepo.axiom-insurance.com/uploads/1/3/1/6/131606490/pipulojoli.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/56330972526.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/jegozebexewefovisapevebeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/angry_birds_2_images.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5745/files/bahia_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/audyt_wewntrzny_podrcznik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/rekovet.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/balancing_chemical_equations_worksheet_9th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/21614886054.pdf
    • https://cdn.shopify.com/s/files/1/0431/8861/7378/files/66100854288.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/14099897286.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_off00005f4e.bin
75a7e740e86b199fd2610bb554fd5dd1d784058f60bf926b13b1e8d7d29632e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 4928 bytes
font_01_sfnt_off0000700a.bin
09ffd86d8cedf2f08276dae43a25d02ebd5f837fc9b889dba0944b0825de6c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700A 11200 bytes

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