Malicious PDF — malware analysis report

Static analysis result for SHA-256 51af3fb6bcd0af12…

MALICIOUS

PDF

41.0 KB Created: 2020-04-08 00:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d200eebea5c9c55918b6a923643ff4c3 SHA-1: c33f0454c9b70f0ada9638db5128bd2af6899089 SHA-256: 51af3fb6bcd0af123dff53592ef2b906fbb3230bdfe706bbe018a36e47746667
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to manipulate search engine results or host malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm, indicating a drive-by download or phishing attempt.

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://humannaturefoundation.com/uploads/1/3/1/4/131438312/131438312.html#skyrim+fast+alchemy
    • http://msftftden2016.com/uploads/1/3/0/5/130588611/lavijap.pdf
    • http://brianabrahamactor.com/uploads/1/3/1/4/131452867/konenuvepaz_zikuzavuwasapa_tokuxogol_rurinumubon.pdf
    • http://australianopalcompany.co/uploads/1/3/1/1/131164266/16266.pdf
    • http://rsdesignservice.com/uploads/1/3/1/4/131482864/9530090.pdf
    • http://nimehime.com/uploads/1/3/0/5/130550700/7c5b71f952e80.pdf
    • http://coloradosugarfoot.com/uploads/1/3/1/0/131070753/7906761.pdf
    • http://22ndsteet.com/uploads/1/3/0/5/130589246/9397249.pdf
    • http://mysouthshorecharteracademy.com/uploads/1/3/0/4/130483307/0008279.pdf
    • http://advertisesozo.com/uploads/1/3/0/6/130604859/7784752.pdf
    • http://indiaglobalnews.com/uploads/1/3/0/9/130969220/tiseluso-biwilujagalor.pdf
    • http://papasconstruction.com/uploads/1/3/0/6/130639561/6675178b3.pdf
    • http://pusht.io/uploads/1/3/0/5/130589245/5499907.pdf
    • http://twintreescowboygear.com/uploads/1/3/0/4/130436306/8444534.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_off00007946.bin
4fe727a1e35bffb19a2c14e1f268a2cb702b6f17c9069d488e7854fdd39d78a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7946 7808 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.