Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e6e43557037a1d…

MALICIOUS

PDF

44.1 KB Created: 2020-06-12 05:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be36f1214e96a0bf64c182811219867e SHA-1: b0508c985b40a4557617ab4ee145912f1f3bcc87 SHA-256: 88e6e43557037a1dc4a4009325d498c58a67d4eea416ebb645442bf92b5861e7
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with the primary heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The document body, though partially corrupted, references 'American history answers' and includes URLs that appear to be part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://syndicatesolutions.ca/uploads/1/3/1/3/131380885/131380885.html#american+history+answers
    • http://nataliamonteagudo.com/uploads/1/3/0/5/130543353/belot.pdf
    • http://alextdesign.com/uploads/1/3/1/4/131407263/1171768.pdf
    • http://mail.spbcmemphis.org/uploads/1/3/1/3/131383352/5594857.pdf
    • http://starttechdigitalmarketing.com/uploads/1/3/0/8/130874432/fdc91c57e4.pdf
    • http://wrebs.com/uploads/1/3/0/5/130542922/8774498.pdf
    • http://meatballsports.us/uploads/1/3/0/3/130323996/zonajizuzikeduj.pdf
    • https://lafesus.files.wordpress.com/2020/06/mixexuvazo.pdf
    • https://namerixug.files.wordpress.com/2020/06/wegijoleraleruromutedez.pdf
    • https://desomelub.files.wordpress.com/2020/06/sajovezejufiralidogufo.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_off0000805c.bin
c5c8fd613ca89c206a80a2464e08f29d6d397d828e2214678634193f69f8951c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805C 11060 bytes

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