Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb59b6921fc7b54…

MALICIOUS

PDF

38.1 KB Created: 2020-04-01 12:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d1d8920426ee5fe59fdb019e90a199f5 SHA-1: dd83c30d2bcc8a4c7c6c471354ce280c8962caf0 SHA-256: 3bb59b6921fc7b542448256c3646c1d6ba16ad56ffb3e8c8dd9bf76c7c71058d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains a URL that appears to be part of this link farm, suggesting the document's primary purpose is to drive traffic to these external sites, potentially for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://tiffanysartshop.com/uploads/1/3/0/8/130874424/130874424.html#que+es+el+dinero+electronico+ejemplos
    • http://thebroadsitalian.com/uploads/1/3/1/0/131070010/4117683.pdf
    • http://lawtonfirstnaz.com/uploads/1/3/0/6/130640191/5448627.pdf
    • http://thefurniturejunkit.com/uploads/1/3/1/0/131070591/6dc01.pdf
    • http://bestconference.net/uploads/1/3/0/8/130874623/4bde4f.pdf
    • http://connectedtoathens.com/uploads/1/3/0/3/130379341/befaroxomuj.pdf
    • http://sweetthymeridge.com/uploads/1/3/0/7/130775515/4831a0180.pdf
    • http://mrsduddy.com/uploads/1/3/1/1/131163787/1903436.pdf
    • http://be-rggr.com/uploads/1/3/0/7/130775707/5805120.pdf
    • http://ezservicesolutions.com/uploads/1/3/0/7/130775737/4d02a0b3.pdf
    • http://hyperbilirubinemia.com/uploads/1/3/0/3/130379770/3246607.pdf
    • http://ikioskenterprise.com/uploads/1/3/0/9/130969515/bozalijuxusezigo.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_off00006d9f.bin
d77f8391453624ebc136d83a62027602190db75c1a35900ca1fb5e8ae4fc2300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9F 7744 bytes

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