Malicious PDF — malware analysis report

Static analysis result for SHA-256 6434a9fafbb81ffa…

MALICIOUS

PDF

43.7 KB Created: 2020-09-01 20:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d824b9ac85f5e1655d485e59503e83ab SHA-1: d0f3deff6fed5633f7b7cf1972f0d61f78367376 SHA-256: 6434a9fafbb81ffa64ffa179ee8f2e0ab0ebbadc9f24479dccb54b461ede3bd5
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=sports+night+font+free', which is flagged as a malicious redirector. The presence of many external PDF links suggests a link farm or SEO spamming attempt, potentially leading to phishing or malware distribution.

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.com/wix?keyword=sports+night+font+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e3ed1f_c76dab3686ef4c61bd28e435059a9550.pdf
    • https://static.usrfiles.com/ugd/b8c837_99fe961d527c40e48348b34a240f6a04.pdf
    • https://static.usrfiles.com/ugd/19103d_a3a3079860234cb58a58d8258671807d.pdf
    • https://static.usrfiles.com/ugd/ae15ca_c6938c837dd6405b8ec023232a5d78b7.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/tasogazivosijud.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6094/files/69606261367.pdf
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/convert_base64_to_file_php.pdf
    • https://static.usrfiles.com/ugd/227d0f_09b6119c953745dfbe7cfae2b71e3400.pdf
    • https://static.usrfiles.com/ugd/ac72e0_0c6290b56fc946c18ddcf9dc819c252a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f25449f8f3d245d2bead0c1867bef2d9.pdf
    • https://static.usrfiles.com/ugd/921909_c85ff2190dc34d19b893f30765ab037b.pdf
    • https://static.usrfiles.com/ugd/8b4172_953ae87056e74690aca229460a87d338.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056a6.bin
85ac1892da02011277fd4dda2e42866cd8ecc9b43ecbf323398e85ebae8108d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A6 5024 bytes
font_01_sfnt_off000067bc.bin
ca39b85a6d365507e29e34be3e52f06cecafcc8666bb5c090fcda47449c3e401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BC 10876 bytes
font_02_sfnt_off00008ce6.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE6 16144 bytes

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