Malicious PDF — malware analysis report

Static analysis result for SHA-256 b524a9b9871b1e47…

MALICIOUS

PDF

37.5 KB Created: 2020-04-14 06:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c67dcf428a4ea6cfd4aa55a5cb73a19f SHA-1: 32be4eae84d6526ce72c33e12977bad62bfa06fc SHA-256: b524a9b9871b1e47e750e0f5211c04a8f7d80da3a861d11fc547e35be43ee38b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. One prominent link, 'http://pvdprerogative.com/uploads/1/3/0/7/130775455/130775455.html#vsco+full+filter+unlocked+apk', indicates a lure for a specific application. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pvdprerogative.com/uploads/1/3/0/7/130775455/130775455.html#vsco+full+filter+unlocked+apk
    • http://insedra.com/uploads/1/3/0/5/130550708/josemopufekuganupi.pdf
    • http://bodyofwork.biz/uploads/1/3/0/7/130738841/3f41f53f43.pdf
    • http://got2go.org/uploads/1/3/1/4/131407588/3936524.pdf
    • http://anewlooknc.com/uploads/1/3/1/6/131606453/tinafobimif_watel_wozibidagopo.pdf
    • http://opnv.sbrsd.org/uploads/1/3/1/6/131637147/5440199.pdf
    • http://skinboostlab.org/uploads/1/3/1/0/131070054/kejuk-mufevamorokabu.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_off000069d0.bin
2841ebc87b1d26d8b3044aa08187ff6bfa5bfcc48d447356e821df86fa21ce37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D0 8480 bytes

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