Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bb60a173018563…

MALICIOUS

PDF

39.8 KB Created: 2020-04-25 15:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbbd823d69736c90b0cfe18efebf4168 SHA-1: a67446f74f934f987dcb5ad6b033c54743192bde SHA-256: 92bb60a17301856390340e1dbe2803a6ccd0fb47f24e996ec032b356e2f8a486
94 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing numerous external URLs pointing to other PDF files. This technique is often used to manipulate search engine rankings or to distribute further malicious content. The presence of a large number of external links, particularly those with numeric slugs, strongly suggests a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://menteriaithcasnewydd.org/uploads/1/3/1/3/131398195/131398195.html#kathy+scruggs+was+the+ajc+reporter
    • http://thebillsguy.com/uploads/1/3/1/4/131407235/e456b0c.pdf
    • http://lions-zeist.nl/uploads/1/3/0/7/130739020/nokowizujada.pdf
    • http://gradschoolhacks.com/uploads/1/3/0/6/130639744/2dcca.pdf
    • http://awashingtonsound.com/uploads/1/3/1/4/131454850/f54847b.pdf
    • http://yourteamspiritwear.com/uploads/1/3/1/4/131438587/50abd0b519af8a.pdf
    • http://magnipace.com/uploads/1/3/0/5/130551986/fusubuvixiv_vevot_pimusewiz.pdf
    • http://houseofcamden.com/uploads/1/3/0/7/130738777/719f94.pdf
    • http://magnipace.com/uploads/1/3/0/5/130551986/fusu
    • 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_off000071d1.bin
0794fee8fa056c577e3842c6a47417d26179f2ee68fb0dea867d4ea0bd51710f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D1 8952 bytes

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