Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8f4ad374388053…

MALICIOUS

PDF

42.2 KB Created: 2020-03-09 05:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 26671cca18b933dc06a59f2097304eff SHA-1: e7657969cb6b5c7ef56c0a7532ec395887b57640 SHA-256: cd8f4ad3743880539072b5bfe9373d9980cc28d2536485672f58418af483fef5
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be a link farm, likely intended to manipulate search engine rankings or distribute further malicious content through the linked PDFs. No scripts were extracted from this sample.

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://sta-66-99-58-198.ladse.org/uploads/1/3/0/9/130969570/130969570.html#matlab+neural+net+gpu
    • http://stephaniebraids.com/uploads/1/3/0/6/130622103/d959f28e5ee55a9.pdf
    • http://wvuhousing.com/uploads/1/3/0/4/130476720/8437512.pdf
    • http://newborntaxidermy.com/uploads/1/3/0/8/130815080/0ccc7d.pdf
    • http://clairereeveslifecoaching.org.uk/uploads/1/3/0/6/130604549/4755511.pdf
    • http://campingdishwasher.com/uploads/1/3/1/0/131070711/490dcd3cbc.pdf
    • http://ibeginwithimagination.com/uploads/1/3/0/4/130483710/9566932.pdf
    • http://energyrise.org/uploads/1/3/0/3/130379361/wikizasawugarav_tekamerepo.pdf
    • http://michaeloharagarcia.com/uploads/1/3/0/8/130814575/375eba5e8caf.pdf
    • http://midcitycarriages.org/uploads/1/3/0/5/130588876/wituvutoseluso_gotupawigo.pdf
    • http://terrellcordaleinc.com/uploads/1/3/0/7/130740480/gavavunuf_nilili_pojuliviguxasaz.pdf
    • http://jwlabs.dev/uploads/1/3/0/2/130287291/jarudelabexorur_repol_gilimowerewoz.pdf
    • http://behaviorbridgecoach.com/uploads/1/3/0/8/130874376/2b7c80.pdf
    • http://74-123-73-230.mgwnet.com/uploads/1/3/0/2/130287989/3939487.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_off00007a7f.bin
e0908c7af190e03af1e2fab3899cfe4f2f71c61e077c56188e49f03603154f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7F 8668 bytes

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