Malicious PDF — malware analysis report

Static analysis result for SHA-256 1388a1f20848b32c…

MALICIOUS

PDF

36.7 KB Created: 2020-04-01 21:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ac57f15ac2f4cec4827842d5b908e30 SHA-1: a26c4304b7b7ab9a890cbe280849845ac95011f0 SHA-256: 1388a1f20848b32cb464af55d93115bebcc3db389b9ea5da2ea36cdc977451e6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files across numerous domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The primary intent appears to be directing users to a large collection of other documents, potentially for malicious redirection or content distribution.

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://photographybyrausa.com/uploads/1/3/0/7/130775130/130775130.html#objetos+con+vocal+u
    • http://gtacessapps.com/uploads/1/3/0/3/130313500/nejuwewerejujowe.pdf
    • http://streetsverifiedstudios.com/uploads/1/3/0/6/130604806/8590905.pdf
    • http://randhan.info/uploads/1/3/0/5/130550858/tutaluwide-buxabokom.pdf
    • http://vincentfatato.com/uploads/1/3/0/7/130775507/lidizamotevena.pdf
    • http://peaceofmindmediation.com/uploads/1/3/0/5/130550768/sopiledaj.pdf
    • http://itsexoticcreations.com/uploads/1/3/0/4/130476885/bowatenumotafi_vamozasijekez.pdf
    • http://crickphoto.com/uploads/1/3/1/0/131069777/pedimimokizo_xutotexefusaw_kupubideku.pdf
    • http://massagesandysprings.com/uploads/1/3/0/6/130604556/wodej.pdf
    • http://oxbowsandmeanders.com/uploads/1/3/0/5/130589374/7df6027.pdf
    • http://our-time-downunder.com/uploads/1/3/0/9/130968962/67cd213bf.pdf
    • http://drashraf.co.uk/uploads/1/3/0/2/130272242/jajibizojit.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_off00006329.bin
6f246caf02e96b19e22fcd07819188a5a630a822c1898e08ba96b60ca892d9bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 9592 bytes

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