Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ee20df128cafb7…

MALICIOUS

PDF

37.9 KB Created: 2020-08-19 01:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc27df9b1876a30a324458eda28a192d SHA-1: 9e4302000ce46b0885e1b65dd0339b9cfbdf67f6 SHA-256: 27ee20df128cafb7f0d89cecfd7a57186f926e22b45d2a2b8723f7ae12ab41ad
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as an 'equilibrium constant calculations worksheet'. This indicates a phishing or scam attempt. The PDF also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to host malicious content. The ML classifier strongly flagged this PDF as malicious.

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=equilibrium+constant+calculations+worksheet
    • http://files.securingourfoodsupplysurf.org/uploads/1/3/0/8/130814633/6443335.pdf
    • http://files.laciegandyphotography.com/uploads/1/3/1/4/131406893/e326e5.pdf
    • http://files.transitionandtransform.com/uploads/1/3/2/8/132814050/5829621.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/vlad_tod_movie.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7383/files/afcat_previous_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0433/5140/8799/files/87719159023.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/jupyter_run_cell_shortcut.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/saratasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2197/5197/files/facebook_messenger_api_templates.pdf
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/50103183539.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/sobubetebesama.pdf
    • https://cdn.shopify.com/s/files/1/0439/7685/1614/files/contraccion_isometrica.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/basic_accounting_principles_and_guidelines.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_off000056be.bin
9ed2241c41d4ba92ed4ffb9afa0a726da468d6348d4f5f6475954f1c5aed0052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56BE 5416 bytes
font_01_sfnt_off00006910.bin
fe493aa8b935fe7e6c134ec82b31eed389b58cfdfea7bde4c9756ec0e6ce7f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6910 9912 bytes

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