Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a55bcf3e67cc84…

MALICIOUS

PDF

39.1 KB Created: 2020-04-06 09:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a4248dec55c9b18b4534e54c295495f SHA-1: 564e97863ce1db982ff4a261178e971fb217aee0 SHA-256: b9a55bcf3e67cc842e0107f5d1641421401ba673790debcf0523c7d9fe10d1a0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains URLs that are consistent with the link farm activity. The primary attack pattern involves directing users to a multitude of external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://brakeactive.com/uploads/1/3/0/6/130621025/130621025.html#cual+es+el+uso+del+diccionario+ingles+espa%C3%B1ol
    • http://bridgepurchasing-solutions.com/uploads/1/3/0/2/130288321/4615130.pdf
    • http://bigfrock.com/uploads/1/3/1/4/131437222/fc3f9a.pdf
    • http://ittevents.solutions/uploads/1/3/1/4/131408024/wowugogu.pdf
    • http://myinstantartist.com/uploads/1/3/0/6/130605307/fizanegugafoj_rodepekiserol_mijozidinoror.pdf
    • http://babybloomdoulaservices.net/uploads/1/3/1/3/131378923/eb0a223828ebd6.pdf
    • http://luxurylodingbylaura.com/uploads/1/3/0/7/130776587/vidaras-fijekes-sitafasiwu.pdf
    • http://dataanalystsusergroup.co.uk/uploads/1/3/0/4/130488498/028ac675d5.pdf
    • http://stoller-handwerkservice.ch/uploads/1/3/0/2/130272364/nevevifazuto.pdf
    • http://theseasoningladyxyz.com/uploads/1/3/0/3/130313358/1502572.pdf
    • http://stonehillfarm1781.com/uploads/1/3/1/4/131453927/redogiwag-rolawipagazina-togozonudu-bebinajez.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_off00006bae.bin
c93fc47ffd6f88081a303d0744f7262d8d5306a77890efd428fdac00f5a5a581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAE 9388 bytes

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