Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c55a1ef294a4509…

MALICIOUS

PDF

48.5 KB Created: 2020-08-05 16:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad81a6b5faffe3376733755c294e456a SHA-1: fca998e39d51ace3fa2f0fa00f7ef8cc5273757a SHA-256: 8c55a1ef294a4509b670d8c6e634a38ff114ecae4a13058bede4664c1824b003
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=acceptability+questionnaire+pdf'. This indicates the document is designed to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. No scripts were extracted from this sample.

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=acceptability+questionnaire+pdf
    • http://pinox.dscampers.co.uk/uploads/1/3/2/7/132712315/wokisu.pdf
    • http://files.faisslibrary.com/uploads/1/3/1/8/131856646/jisujetade.pdf
    • http://saduviv.newthingsshopnc.com/uploads/1/3/1/4/131453109/surotilujofemewuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3087/2215/files/wimenotozirafalujo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/79769440880.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/nitilu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/jufoku.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/2250869118.pdf
    • https://cdn.shopify.com/s/files/1/0428/7037/4566/files/tepituduvotawoteperorefod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/69328712234.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/betux.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/35203417928.pdf
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/44222166955.pdf
    • https://cdn.shopify.com/s/files/1/0429/3220/7782/files/great_gatsby_chapter_7.pdf
    • https://cdn.shopify.com/s/files/1/0439/0594/1672/files/geponafasotemawot.pdf
    • https://cdn.shopify.com/s/files/1/0429/8807/7209/files/golewunoperaxalos.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_off00007d20.bin
f6daf18bc811d67622e66f2b0380919eb7dfa3fc529fecd5deaee7f8a4808e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D20 5504 bytes
font_01_sfnt_off00008fe9.bin
2f55ccd75962f8b2a307183ccfcea4ae635e984db7669f9004eb78df68dca533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE9 10904 bytes

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