Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1edd408d2d7633d…

MALICIOUS

PDF

28.9 KB Created: 2020-06-08 20:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b013527dabbf412a589db75441cbcdcc SHA-1: 6ed93270fd952b7565e5fc2617817fbe47804298 SHA-256: a1edd408d2d7633d06a0f3897babee719420ce8c7193f26cc0522ccac903446c
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. The document body also contains a URL that appears to be related to study guides, suggesting a lure. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification. The primary attack pattern involves directing users to a network of external resources, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://broadsword.com.au/uploads/1/3/0/4/130483542/130483542.html#asvab+electronics+study+guide+quizlet
    • http://mail.nightowlb.com/uploads/1/3/0/7/130775921/5bd9d246.pdf
    • http://faithfc1.org/uploads/1/3/0/7/130775808/wilurizija-gobilupasirid.pdf
    • http://evergreenehikes.com/uploads/1/3/0/4/130489800/8383961.pdf
    • http://blomstuinservice.nl/uploads/1/3/1/4/131482850/7159326.pdf
    • http://webmail.kevinscustomagltd.com/uploads/1/3/0/6/130639068/59faf0d3e7b57.pdf
    • https://vumemifi.files.wordpress.com/2020/06/75515511459.pdf
    • https://piledina.files.wordpress.com/2020/06/23371500112.pdf
    • https://diworof.files.wordpress.com/2020/06/jegerebomawejasufi.pdf
    • https://xiletemud.files.wordpress.com/2020/06/7384218408.pdf
    • https://sejidinaduk.files.wordpress.com/2020/06/96595925332.pdf
    • https://kunemepor.files.wordpress.com/2020/06/vedopimaxi.pdf
    • https://gujobuzagam594322867.files.wordpress.com/2020/06/63545444253.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000489d.bin
553c40804adb4e1bb5adc6f0f5c8aaf567f368903e9f4b55304ee6adb662c084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x489D 9424 bytes

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