Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a006f3568310632…

MALICIOUS

PDF

65.4 KB Created: 2020-08-06 20:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cdc49e63cb490fbb9e14abeb34c34ea SHA-1: bd33b0263f39a6b2521656043ee6327c68e8d4f4 SHA-256: 7a006f3568310632958157c8b45949675941a17f39c1ab17d8eed79297d55320
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO spam operation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious objective. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent. No scripts were extracted, but the PDF structure itself facilitates the 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=digestion+of+carbohydrates+in+non+ruminants+pdf
    • http://files.labandmasters.org/uploads/1/3/2/6/132682883/sogugoted_befivufenoxufe_filozapefus.pdf
    • http://files.dthaikitchenthornwoodny.com/uploads/1/3/1/4/131484603/gejaruwi-zibojebelomu-lukezolalobe-zuzav.pdf
    • http://files.wedronecostarica.com/uploads/1/3/0/9/130969855/3fcee.pdf
    • http://files.felicecurcelli.net/uploads/1/3/0/7/130775701/6621894.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/zunazij.pdf
    • https://cdn.shopify.com/s/files/1/0430/2661/2378/files/26232865653.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0147/files/xokaridodofagawelib.pdf
    • https://cdn.shopify.com/s/files/1/0428/5408/8871/files/97391836990.pdf
    • https://cdn.shopify.com/s/files/1/0430/9234/4999/files/banudofiburu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/kijok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8091/6893/files/pujiwopezude.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/xeresodevebotimulixelibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/35117307677.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/95348589106.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/pofofalera.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/semivimodupuzugidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0617/3077/files/baby_driver_full_script.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c190.bin
d7e35c74125363c5407ef4fcbc68b3613c643fd312fa50daec478070d3a56c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC190 5780 bytes
font_01_sfnt_off0000d51e.bin
63871234ce5dcba175da8484a24b186d17f8082a0ec8333a286d2c9736157667		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 10136 bytes

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