Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4a74a421647eb9…

MALICIOUS

PDF

36.6 KB Created: 2020-04-08 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5a5be9f2f3ba21b19c799bbde0fefbc SHA-1: f4d5e5560dc408aec9f7543ab734ee27b1cb1197 SHA-256: 4e4a74a421647eb925df262f632e8867298157c307317f90fce50333f9b83504
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The primary URL http://ntr4cbd.net/uploads/1/3/0/5/130550971/130550971.html#behold+the+dreamers+chapter+6+summary is presented within the document body, disguised as a chapter summary. This indicates a social engineering attempt to drive traffic to potentially malicious sites.

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://ntr4cbd.net/uploads/1/3/0/5/130550971/130550971.html#behold+the+dreamers+chapter+6+summary
    • http://mam-design.com/uploads/1/3/0/7/130775269/kurobamu.pdf
    • http://jessicagaul.com/uploads/1/3/0/2/130272361/6271131.pdf
    • http://extractvaluenow.com/uploads/1/3/0/7/130776368/wozowulixakol_sameba.pdf
    • http://opiadelaide.com/uploads/1/3/0/4/130488666/fofelek-sugasemotekasid.pdf
    • http://multiiverse.space/uploads/1/3/0/6/130620919/jizoma-nivowodabe-tavuxuwul.pdf
    • http://jdberko.com/uploads/1/3/0/2/130289270/3342deff.pdf
    • http://pastillacytotecenelsalvador.com/uploads/1/3/0/3/130323794/ed93e4b2d330c4.pdf
    • http://dmoorephotos.com/uploads/1/3/0/4/130483041/poxawumewabeb.pdf
    • http://service-share.org/uploads/1/3/0/5/130551472/6e2e1151017.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_off000066d7.bin
c7a10ec53f1a450dd44505ee8a881d978cab7762ec1fba7d2d9c46e91867ba5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 7500 bytes

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