Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9439ae33c2d9f81…

MALICIOUS

PDF

37.4 KB Created: 2020-08-30 17:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a8579dee4279c520a5dcfeb87d172fd SHA-1: a966bee57c0e31957c153c5a438491c9e0d1fc6e SHA-256: f9439ae33c2d9f814494aebb6ce95ba14c93ab489d076c7bec9dc26ca4a2e8ab
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The primary malicious URL identified is https://ttraff.ru/wix?keyword=lotus+elise+handbook, which is likely used to redirect the user to further malicious content.

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=lotus+elise+handbook
    • https://static.usrfiles.com/ugd/63d3ad_510f72eb296640fe978a4c20e8f09c5a.pdf
    • https://static.usrfiles.com/ugd/83b1b3_14f93caebeb44019822c8386642d20c7.pdf
    • https://static.usrfiles.com/ugd/2b25b5_42abe63c35884a229734a6f199558780.pdf
    • https://static.usrfiles.com/ugd/8c2aca_3ab1509645cf42b4a61ad59ed41cc633.pdf
    • https://static.usrfiles.com/ugd/87a178_0eb7128e4e1c489e9e0c3400b464b614.pdf
    • https://static.usrfiles.com/ugd/9cb927_34829ca6245c459dae2d2ad55c54ea53.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/chicago_fire_season_6_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7256/files/lelix.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/15805296529.pdf
    • https://static.usrfiles.com/ugd/455f95_19d25ca78dc74f5a98eb4a94944ec5c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cefc7238c4540a884b66f684e1a503d.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_off000054ec.bin
9323352315c94bf50dc18b3d313d68bf105f80a6b6adb13a253ca4bd5cb8e9fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54EC 4960 bytes
font_01_sfnt_off000065be.bin
114aa0f53ce63a36e0830633a097ac46ec061ae55466e4e638c3deeddb996293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 10676 bytes

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