Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6340c236065ab1…

MALICIOUS

PDF

44.5 KB Created: 2020-08-30 05:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a5aad6b2ef11c643ef47e478b2b678a SHA-1: bce279beebd2453d2d476f120f043778197f46f7 SHA-256: ec6340c236065ab15876b8619333f9b5efa63be0a807bab6c9b626f8b189b5d7
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=convert+ml%252F+kg%252F+min+to+l%252F+min'. Additionally, the file exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, indicating an attempt to lure the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=convert+ml%252F+kg%252F+min+to+l%252F+min
    • https://static.usrfiles.com/ugd/b8c837_de39db9160a14e5b852ed7e15ec69196.pdf
    • https://static.usrfiles.com/ugd/36f25b_952c67afd8774b1b8e2133ef3ffa5d7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f01ff7c3d394347bf32dd19df69c6b9.pdf
    • https://static.usrfiles.com/ugd/0f1814_3ccb53e7133143e3bd5f4defa00dcfe5.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/55692429828.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/xevoxadatof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8334/1728/files/98911688817.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/lukakufibawopu.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7be3290c59e42d39fbaece658f1d0a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f63b7dda1d4145da991c40674ec6acab.pdf
    • https://static.usrfiles.com/ugd/b8c837_b02aa0ade46f4f23bf2127895aa77f3b.pdf
    • https://static.usrfiles.com/ugd/d2751c_e61c476773164f3bb9bb28535c2d6e38.pdf
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/history_of_atlantic_slave_trade.pdf
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/american_red_cross_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/sample_of_contract_agreement_between_two_companies.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/wedding_dinner_invitation_template.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_off000071a8.bin
77a68a34aeef0c963137e8efea015be0e0ac755a6a1cdf02705a361f7b967ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A8 4684 bytes
font_01_sfnt_off0000818f.bin
7668bc0fe0319608e5c537866ca5d0dd8577cc2825a1c7f4f5d69659b06672c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x818F 10536 bytes

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