Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af76b7168bacea2…

MALICIOUS

PDF

64.2 KB Created: 2020-08-07 05:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bad6b154b8b9053ce91609287fa50d0 SHA-1: 7ec51cad468bd894d47877c300c0b0774d588782 SHA-256: 4af76b7168bacea2bd862ea1cd8c8a2b9fbe5b0e2cd77e78c8303eb04873c61a
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', which is likely used to funnel victims to further malicious content. Another heuristic indicates a link farm structure, with many links pointing to Shopify-hosted PDFs, suggesting an attempt to obscure the ultimate destination or to leverage a seemingly benign platform for 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.ru/pify?keyword=symlet+wavelet+transform+pdf
    • http://files.battlegroundfp.com/uploads/1/3/1/4/131437423/9734175.pdf
    • http://files.flixhairandmakeup.co.uk/uploads/1/3/0/7/130775725/400fc867bcf52d6.pdf
    • http://files.kinematicintegration.com/uploads/1/3/1/8/131856160/lijidudat_wigap_jixoruritepa.pdf
    • http://jopopiso.altofrio.com/uploads/1/3/1/4/131454065/weragisuvibis_manaxebosumate_kosilanakipiko_zirudopozoz.pdf
    • http://files.hh4j.org/uploads/1/3/1/6/131637014/9867935.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1463/files/tutosadoxerinez.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6561/files/74477880679.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2560/files/vefapumonotazewoter.pdf
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/vibolatexatafovoxoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/6526/9669/files/12576711786.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokukivovasogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7904/files/82072926177.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/64965187839.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2696/files/94053087327.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/nisavagofupemogefurupud.pdf
    • https://cdn.shopify.com/s/files/1/0432/3737/6157/files/mountain_valley_express_tracking.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixet.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_off0000b589.bin
6ff1ff1586cecc0c4001f5752303cd46a3057e1a5a023ea43c574a48373b6ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 5544 bytes
font_01_sfnt_off0000c86a.bin
e1edbf320b9c19082e01473952112b9f5ef1456284fdfe24ee6663b5f06e7a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 12956 bytes

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