Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37729bae4689d3a…

MALICIOUS

PDF

33.5 KB Created: 2020-08-14 19:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 065141fb081bddefdbb1a68660f0bd8b SHA-1: 8765a4824a5b11f176aecd5d7f97a74596860b5c SHA-256: a37729bae4689d3a0f26ca02d56cccd3e6d4b6ce12a21e7bde345b7413929334
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics as malicious, specifically for containing a link farm and redirecting to known malicious infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=assetto+corsa+car+setup. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's a lure document. The presence of numerous links to Shopify-hosted PDFs, while many are benign, contributes to the overall link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=assetto+corsa+car+setup
    • http://files.artdecuivre.net/uploads/1/3/1/3/131380021/afbcc3bcb4e5.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6951/files/biology_terms_and_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/guide_to_federal_pharmacy_law.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/clark_color_labs.pdf
    • https://cdn.shopify.com/s/files/1/0440/6660/3158/files/bezoxexoxibolubigenajume.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/66147041977.pdf
    • https://cdn.shopify.com/s/files/1/0432/2705/4237/files/14543201871.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/34052990533.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1158/files/seven_steps_to_problem_solving.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9781/files/lowes_canandaigua_ny.pdf
    • https://cdn.shopify.com/s/files/1/0439/0833/3736/files/88714932833.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_off000046c1.bin
7f4b3b44cdce9c95ebead6a1429ee408473f02ed7f1468fe5ebfb26d34c67a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46C1 4884 bytes
font_01_sfnt_off0000576a.bin
2c18e774930663edce102b1b75edfbfc3ba9fc9653bd6e17d3b33bd91ae8ef58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576A 10068 bytes

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