Malicious PDF — malware analysis report

Static analysis result for SHA-256 c785fc92da67b243…

MALICIOUS

PDF

46.2 KB Created: 2020-04-20 01:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ac9de90f94d34648bf1038b4fd6a5967 SHA-1: b066833947ae26bb7eaff7379e9421b1d7c27809 SHA-256: c785fc92da67b24351aec6d4584bfdf753fa561f3ca8119bcabaf537a0af9f70
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous external links, flagged as a link farm, directing users to various domains. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains references to 'Fallout 4 nuka world factions guide', suggesting a lure to attract users to potentially malicious content hosted on the extracted URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 3

  • 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
  • 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://dinosgrooming.com/uploads/1/3/0/8/130874526/130874526.html#fallout+4+nuka+world+factions+guide
    • http://modernizingproject.com/uploads/1/3/0/6/130620313/4823ef049.pdf
    • http://nhlitigators.com/uploads/1/3/0/7/130775940/3324797.pdf
    • http://connerwriting.com/uploads/1/3/0/5/130589009/nadoma_giledumuru.pdf
    • http://yogaphysiosydney.com/uploads/1/3/0/4/130483871/6b70f3a0e65.pdf
    • http://studioesalonspa.com/uploads/1/3/0/7/130775879/7287735.pdf
    • http://connerwritin
    • 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_off00008cd0.bin
b0686e6646857febffb70139a6c2736deab30b5a62a1008a6599b98b011b833a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD0 8548 bytes

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