Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d9d23cd7b0aa58…

MALICIOUS

PDF

36.7 KB Created: 2020-04-06 10:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1fceed8ea2ace1953a19277e7ebf2976 SHA-1: b8480aa335b99ab21a0c378877a18b35c556e087 SHA-256: 67d9d23cd7b0aa58c72f7ffd2697c5c0a8fe5ef01c147c8c104d75190db72597
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a link-farming or redirection scheme. The document body contains text related to 'Messenger secret conversation new device' and includes URLs that appear to be part of this scheme. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://thekeyanni.com/uploads/1/3/0/7/130740013/130740013.html#messenger+secret+conversation+new+device
    • http://74-123-77-221.mgwnet.com/uploads/1/3/0/9/130969829/1503567.pdf
    • http://getandkeepbiz.com/uploads/1/3/0/6/130604682/1982809.pdf
    • http://starstuffwithstuartgary.com/uploads/1/3/1/4/131437821/894ca72.pdf
    • http://defensecolorado.us/uploads/1/3/1/4/131438432/neririze.pdf
    • http://apocalypsefitnesspdx.com/uploads/1/3/0/7/130738943/a7646940f06.pdf
    • http://davyddchong.com/uploads/1/3/0/4/130435578/wijikek-timiguredelo.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_off000064f1.bin
e6f4737098f3cb401349468d32446503e1e0b41a6005675e0dd9550a0bc45a8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F1 8616 bytes

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