Malicious PDF — malware analysis report

Static analysis result for SHA-256 8768233b145e323c…

MALICIOUS

PDF

55.7 KB Created: 2020-08-19 21:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d27e4b40801c73c2bffd6444ad9b39fe SHA-1: f0052c4e957cf95df13cdd51dcc2f64176bbb090 SHA-256: 8768233b145e323cb1bb8939baa3b8f0cd91f9ad0830704f7f972a98ed1dce55
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a direct link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=guide+michelin+paris+75009
    • http://files.prismcounselingservices.com/uploads/1/3/1/4/131438069/9059803.pdf
    • http://files.revelrytheatre.org/uploads/1/3/1/4/131437552/4677876.pdf
    • http://jenaz.universityclubathome.com/uploads/1/3/1/4/131407945/xubizuva.pdf
    • http://bowineder.scienceofspace.com/uploads/1/3/0/7/130775540/73e731.pdf
    • http://fivokira.arm-group-llc.com/uploads/1/3/0/8/130874493/7b0e018b8865805.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/vodimudagigafapazuviwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/sazonefelanefaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/arellano_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/jixijutazifekifadogadu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/16473221368.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/ml_to_meters.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/85814943126.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/suzuki_ds80_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8402/files/14220230688.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_off00008936.bin
a8e4aa585065c9e666923c36333bb1b8a9c32373bc4052371f7f1a8196b94da2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8936 5844 bytes
font_01_sfnt_off00009cf5.bin
05db6ab9f6b7469f8ff317b412ff58360ecca1a3e6165f23b3d48c34b13e5769
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF5 19840 bytes