Malicious PDF — malware analysis report

Static analysis result for SHA-256 514e527b4c4fac0a…

MALICIOUS

PDF

38.6 KB Created: 2020-04-08 01:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9f6e95932c813159da80c87b8aa379e SHA-1: f4bab749fae1be910b269e184da3e175833bd604 SHA-256: 514e527b4c4fac0af49765e8e2dd2f76d8794d1aaa45129aa3d102776eb24c9c
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF documents hosted on various domains. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users through these links, likely to a malicious website or to download further payloads. No scripts were extracted, but the extensive use of external links suggests a redirection or content delivery mechanism.

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://nannynooeventco.com/uploads/1/3/0/5/130551339/130551339.html#percy+jackson+minecraft+server
    • http://meredithbirrell.com/uploads/1/3/0/5/130545199/fa80534.pdf
    • http://grandbhutanadventures.com/uploads/1/3/0/5/130539102/jupal.pdf
    • http://pbmus.net/uploads/1/3/0/7/130740217/4481917.pdf
    • http://lewisagdesign.com/uploads/1/3/0/7/130740590/lavelogufogoxenageni.pdf
    • http://vjohnsonperceptionsllc.com/uploads/1/3/0/7/130739614/roxuxubodu-kazirefemino.pdf
    • http://mta-sts.mail.littlecedarcemetery.org/uploads/1/3/0/7/130775980/tawipiwulo.pdf
    • http://fancynancyshousecleaning.com/uploads/1/3/0/4/130483737/lozogebu.pdf
    • http://ersolucionesmedicas.com/uploads/1/3/0/7/130740265/7d88ccafe0.pdf
    • http://greyegg.com/uploads/1/3/1/4/131437918/siwobarojapekuxi.pdf
    • http://vilardiplumbing.com/uploads/1/3/1/0/131070998/gemalajilefani.pdf
    • http://queencitynursingcenter.net/uploads/1/3/0/5/130550684/momanuboloxi.pdf
    • http://airomaclothing.com/uploads/1/3/0/4/130483118/637ab45497.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005966.bin
ac5d8da47417b6fc3503010ced75cd560e5f7e1ce19e456b6933bfb52d89f613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5966 7532 bytes
font_01_sfnt_off000076dc.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DC 16036 bytes

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