Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8df330227495f7…

MALICIOUS

PDF

38.3 KB Created: 2020-05-30 22:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09d98862724a434635dacba5fdc02204 SHA-1: 58b316dd44f562ff807975f409492f47b712f61b SHA-256: 0f8df330227495f71112075fdeab4bdf8f09a0d63b38701f93b40fdb2dd4aced
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as PDF files with numeric slugs, indicating a potential link farm or SEO abuse for malicious purposes. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a "Paladin 5e spell list", suggesting a social engineering pretext. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://nexisnailsystems.com/uploads/1/3/0/7/130776674/130776674.html#paladin+5e+spell+list
    • http://mx.rtscenic.co.uk/uploads/1/3/0/4/130483155/3986341.pdf
    • http://bbjgroomingsupplies.com.au/uploads/1/3/0/3/130379293/gutaxe.pdf
    • http://hayleysusanphotography.com/uploads/1/3/0/2/130273980/7431029.pdf
    • http://kidswego.com/uploads/1/3/1/3/131379699/subigo.pdf
    • http://royalecomputing.com/uploads/1/3/0/6/130604685/d93baf0800584.pdf
    • http://carepackageessentials.ca/uploads/1/3/0/6/130639875/dumegatagun-situnagov-wetado-zatuwobofelafow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d48.bin
bc387ae0949b04298620606f5c5f14cb6f19f519948ca9b09cc09daca6635d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D48 9740 bytes

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