Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caac751403f3af8…

MALICIOUS

PDF

38.2 KB Created: 2020-04-01 19:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6e1fe234213b1c3ea67919f9820670eb SHA-1: c6ca858775ebeace4c7257dd4c5916a46789f524 SHA-256: 5caac751403f3af81f52b58ca574ae4e9315bb69c325c1c501eda6017f55cc40
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs supports the conclusion that this document is designed to redirect users to potentially harmful content. The document body itself is heavily obfuscated and contains what appears to be a reference to a movie title, likely as a lure.

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://audiofidelity.no/uploads/1/3/0/6/130639468/130639468.html#harry+potter+and+the+deathly+hallows+part+2+dumbledore%27s+brother
    • http://lucidcitymusic.com/uploads/1/3/0/7/130738673/204191086e30.pdf
    • http://tucsoninabox.com/uploads/1/3/0/2/130291434/duxomat-tefisumusimo.pdf
    • http://aboveitco.com/uploads/1/3/1/4/131455903/bobigasoxubesop_tumedosopi.pdf
    • http://christchurchveins.com/uploads/1/3/0/5/130551015/zigalefefivomiput.pdf
    • http://atronach.net/uploads/1/3/0/5/130551198/xawidotiragixudimi.pdf
    • http://pegasusglobalfinancecapitalsa.net/uploads/1/3/0/4/130476976/4314183.pdf
    • http://nityakumar.com/uploads/1/3/0/5/130588220/xikukojeku.pdf
    • http://florajamesphotography.com/uploads/1/3/0/2/130270743/1099960.pdf
    • http://terraweelz.com/uploads/1/3/1/0/131070131/5963317.pdf
    • http://vedicastrolink.com/uploads/1/3/0/3/130323532/7980372.pdf
    • http://sugarpaso.com/uploads/1/3/1/3/131384082/9db16e78d255c37.pdf
    • http://duckertstore.com/uploads/1/3/0/7/130776518/jujudoxebu.pdf
    • http://sonrisasparadios.org/uploads/1/3/0/8/130813094/1654301.pdf
    • http://www.altenpflege-wuerdevoll.de/uploads/1/3/0/8/130874053/lorup-nukipat.pdf
    • http://uconnalphaphi.com/uploads/1/3/0/6/130620674/8668644.pdf
    • http://atlantatuskegeealumni.org/uploads/1/3/0/6/130621557/535b00a6.pdf
    • http://toyfactoryfab.com/uploads/1/3/0/4/130483351/5583854.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_off00006dfb.bin
f30460b6868577e6efd08232690d909aac21e3c6e06e400dbaddcaad4cb8d688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFB 7464 bytes

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