Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3770a02d82f2a6…

MALICIOUS

PDF

40.9 KB Created: 2020-08-03 06:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 058407907462393c1e018aa0d411c80d SHA-1: c8df9f00380cf8218f4d917b2532c1f468c67076 SHA-256: ad3770a02d82f2a69fc8458a57769711835c7efeb5b49bbf13c2680478123518
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is presented within the document body, disguised as a free SSAT practice test. The PDF also contains a large number of embedded links, many hosted on Shopify, which is characteristic of SEO link farm abuse. The ML classifier strongly indicated maliciousness.

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.ru/pify?keyword=free+ssat+practice+test+pdf
    • http://files.akcedarbox.com/uploads/1/3/1/4/131437932/6e492f6a124c7.pdf
    • http://files.martialhartamas.com/uploads/1/3/0/8/130814279/6186ec0be38b.pdf
    • http://files.californiabrittanyclub.org/uploads/1/3/1/6/131606392/nutupadudojaviw.pdf
    • http://files.portogether.com/uploads/1/3/1/4/131453799/69d19fe878c.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/xagef.pdf
    • https://cdn.shopify.com/s/files/1/0429/9109/1875/files/83334850997.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/fososumoxaxafexali.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/83849157957.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/batadeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/2009/7448/files/69906725831.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/30774423008.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/80526713671.pdf
    • https://cdn.shopify.com/s/files/1/0428/8361/2831/files/lemijusimojozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/86871707391.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/54160421947.pdf
    • https://cdn.shopify.com/s/files/1/0429/9427/0371/files/79607225840.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_off00006216.bin
701bde5a9f55f628c31284d9f19baa11d2d58de7ed4829d919073e039ae69ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 5072 bytes
font_01_sfnt_off00007368.bin
ed4b85edfae44a32e847fd798eb819b648dda7df0d7d5cba60d3a6eefc03e419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7368 10432 bytes

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