Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91f6263463db0b3…

MALICIOUS

PDF

33.8 KB Created: 2020-04-21 04:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2184ac464e53b889fdd8f595c33cd83f SHA-1: 67b706b37064c298202318ca4310b19a01db63cb SHA-256: f91f6263463db0b33cefe81bc5629a9d253cc662b8205e9f158f831c23d16b8f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to meditation and sleep, which is likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ceoempowerment.net/uploads/1/3/0/5/130588297/130588297.html#binaural+beats+guided+meditation+for+sleep
    • http://mobilebillboardspaloalto.com/uploads/1/3/0/6/130639824/2663604.pdf
    • http://richardneeve.net/uploads/1/3/1/3/131398252/firalefasejume.pdf
    • http://lifechangesupstatesc.com/uploads/1/3/0/8/130874164/26417.pdf
    • http://maritimeinsurancebroker.net/uploads/1/3/0/6/130640198/188681.pdf
    • http://georgiahistoryexpo.com/uploads/1/3/0/4/130436258/21072b6.pdf
    • http://danieljameshughes.com/uploads/1/3/1/3/131380971/rusowafokivi.pdf
    • http://cookstown.ca/uploads/1/3/1/4/131407767/3c6d98a3dd06.pdf
    • http://langresbookshop.com/uploads/1/3/0/6/130620677/fiwas_zugoxumagib_renaxopas_silazojuvimax.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_off00005f81.bin
a0f01264a6ba0510b2a506c59ee9f070a406f32917ee57186a3e993af13165b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F81 7088 bytes

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