Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d3f8b114b4976c…

MALICIOUS

PDF

39.6 KB Created: 2020-08-29 09:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 922e82cec6bd239947ab7f135d38e146 SHA-1: ed2b9ab66f2512895d8acf28a177e9342fa3ed2a SHA-256: c9d3f8b114b4976c0d539439f2bb68a79b18e5cfc40b258bc5a945d078d7987f
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further stages of an attack.

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/wix?keyword=%2525D1%252584%2525D0%2525B8%2525D0%2525B7%2525D1%252580%2525D1%252583%2525D0%2525BA+1+%2525D1%252581%2525D0%2525B5%2525D0%2525B7%2525D0%2525BE%2525D0%2525BD+15+%2525D1%252581%2525D0%2525B5%2525D1%252580%2525D0%2525B8%2525D1%25258F
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/aprendizajes_clave_de_ingles_secundaria.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/98384466201.pdf
    • https://cdn.shopify.com/s/files/1/0440/6483/3686/files/gawopuru.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/promissory_note_template_for_employee_loan.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/35399580816.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd09ff8b39dc45ffbba8d63e1564af44.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa95854cc88841c696f29247252cd6fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_470c600901784a6480168fd239ba6a75.pdf
    • https://static.usrfiles.com/ugd/b8c837_40b0e2f330ed48b687c04fd0fa65e47c.pdf
    • https://static.usrfiles.com/ugd/b8c837_be614cb940534a99ba493049139c3711.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa38f5f508a34661a59de1469f72e0cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_23ff7ac0614c439492cf69df7c255c09.pdf
    • https://static.usrfiles.com/ugd/b8c837_40f97e0fbb804426817f6eb5bfaa3cf0.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_off000048f8.bin
f7bda868e0528745d9070c2cf41b0738beb472e76b0de2befa57fbf40457652d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48F8 5476 bytes
font_01_sfnt_off00005b49.bin
cc79f3413eb314df037fef9f6ae0404d4548137cf3f0f2f9e115a08c6f295a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B49 17764 bytes

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