Malicious PDF — malware analysis report

Static analysis result for SHA-256 553ba4368cda1780…

MALICIOUS

PDF

41.0 KB Created: 2020-05-29 12:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b5cad856fa28d8e01bfcc9f426f7f2 SHA-1: 7c7875ca64deb9c7bf316e82c658e3ea4f96ce8b SHA-256: 553ba4368cda1780fef8563d38a1a47f6a84e7419852efaf7b7cb641a5f2799f
94 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of external links, characteristic of a link farm. The document body, though partially corrupted, contains references to URLs that are also listed as embedded URLs. These URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bbb.voyagerwebsites.com/uploads/1/3/0/6/130605116/130605116.html#rogue+pvp+guide+wow
    • http://kingsandqueensny.com/uploads/1/3/0/5/130551505/119861.pdf
    • http://magesterconsultantservices.com/uploads/1/3/0/5/130589331/1fb545818f9776.pdf
    • http://duo.is/uploads/1/3/0/6/130605338/mufasu.pdf
    • http://cozartsentertainment.com/uploads/1/3/1/6/131637841/5027035.pdf
    • http://fchuiyuk.org/uploads/1/3/0/2/130288510/wadaputobuk-vemitof-zukavomir-fejimazev.pdf
    • http://juice4charity.org/uploads/1/3/1/3/131383645/lejazapav.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_off00007514.bin
a981d75699a29d53cd984642079b202f4116fadc9e4291084769a13a3c34461c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7514 10612 bytes

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