Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88f0e3440f24ff3…

MALICIOUS

PDF

30.1 KB Created: 2020-04-09 00:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f598148fad05a23a173bf2e0a5f96cf6 SHA-1: f1ae099c5ac3f18391ed117b9f8f63666267ba79 SHA-256: f88f0e3440f24ff3a49448d6be1915e05a81f6c112d09be2858bbdfa0422a751
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, contains a lure related to a popular movie title, suggesting an attempt to attract users through search engines. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/1/3/0/8/130814845/130814845.html#bajrangi+bhaijaan+video++pagalworld.+com
    • http://hregan.com/uploads/1/3/0/5/130539928/33c868d70bea751.pdf
    • http://lmcommunityfoundation.net/uploads/1/3/1/3/131379759/ab3ef2db1ba5.pdf
    • http://treblestatus.com/uploads/1/3/1/1/131164131/koziriso.pdf
    • http://boatinsurance.wales/uploads/1/3/0/6/130604292/buwivavowozu.pdf
    • http://arqbuildingdesign.com/uploads/1/3/0/2/130289410/vobine-subigigopi-kibebi-maxiraw.pdf
    • http://zypora.com/uploads/1/3/1/3/131398193/4c345e8e9e9.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_off00004f48.bin
19bc07e58497576b02ab88f60dc5ac903cd4ea26f92124997bb09edccb3af1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F48 7232 bytes

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