Malicious PDF — malware analysis report

Static analysis result for SHA-256 642c9055d4f49634…

MALICIOUS

PDF

42.6 KB Created: 2020-09-05 14:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ad6dd15d5e98af26e0982ea850dd186 SHA-1: ecdf611f34c22f2af6b87e18107cfd03f009e7c6 SHA-256: 642c9055d4f49634c371977e2a3207f16da26c57d4ed0550a2c7fa7df2fcab92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.club/wix?keyword=credit+information+reporting+agency+fiji
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/astm_a536.pdf
    • https://cdn.shopify.com/s/files/1/0430/1619/2153/files/lezavilavuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/vijaxezivak.pdf
    • https://static.usrfiles.com/ugd/76156b_6531b3192fa442c4aa9031678bffe1cd.pdf
    • https://static.usrfiles.com/ugd/07625c_87e962a1be5f49e0bc3bf364535166d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c983ada6ea3d434b894a2931d6bcda20.pdf
    • https://static.usrfiles.com/ugd/4b7290_e0c05987911f4c91a0953f2db0cd8339.pdf
    • https://static.usrfiles.com/ugd/b8c837_192c92c0d559484dac893d6c930670a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2685bb0124642d180590ce27b53133b.pdf
    • https://static.usrfiles.com/ugd/97493d_a9a10b456c5046c6bde65c27d530c5b0.pdf
    • https://static.usrfiles.com/ugd/1813b3_7aec9f855c114f1e825c7a5d8a315046.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_7108f76233c14e778521bd76a359d481.pdf
    • https://static.usrfiles.com/ugd/73cb9e_d1bed5c700ae4d20bb0c80a255c7a388.pdf
    • https://static.usrfiles.com/ugd/1be480_6647f057ef3747a28532f770eae10cf8.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_6f0ba81a232d4e2191ed5bc0bca783fe.pdf
    • https://static.usrfiles.com/ugd/ca300b_4102f3a12d274b3bb87cc01d4803d732.pdf
    • https://static.usrfiles.com/ugd/ac8c68_12cb9d3fcce346909cfd53554d35108d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006367.bin
812f3711bd7e804da876e41346de883192d2067b2a5d30f735c2eef878315617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 5348 bytes
font_01_sfnt_off0000758f.bin
632030abd6f68d25570216d883f60ab5e7d202c39c7827bf3b6285b72c3923b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758F 11208 bytes

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