Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9888767011d978…

MALICIOUS

PDF

48.9 KB Created: 2020-08-15 10:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98e964f8fa3326d07568546c668b4b50 SHA-1: d9f45a19d034d7e24f950d609c6617a992b02a6c SHA-256: fc9888767011d97825802ed55d9770bb80198ac0cc7575150ab3bf81e52c68cc
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=broomstix+rpg+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references 'wkhtmltopdf', suggesting it was generated by a tool rather than being a legitimate document.

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.com/pify?keyword=broomstix+rpg+pdf
    • http://files.grantcountyinfair.com/uploads/1/3/0/7/130740464/siwofefojogudes.pdf
    • http://files.westerhamu3a.org/uploads/1/3/1/8/131859895/1316213.pdf
    • http://files.ponderosaathleticboosters.com/uploads/1/3/1/3/131384101/wokum.pdf
    • http://files.grantcountyinfair.com/uploads/1/3/0/7/130740464
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/malaleferisimajurupuri.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/96416258119.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budazasinopuxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/98069736709.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/most_realistic_minecraft_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/sample_data_analysis_in_qualitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/4266124815.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/next_day_air_saver.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/44239091738.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/momekenifejetepuwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/61445475845.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_off00007de3.bin
ff192cd8f3df0f09dd63f34388ce9e2a439d152100d62575f5e52e2ca7174224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE3 5236 bytes
font_01_sfnt_off00008fad.bin
ab1c5fa490973386e894ad558ef3e8709449bd2aa02e7391893b19b2cbac246e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAD 11956 bytes

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