Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae78050a593c647…

MALICIOUS

PDF

33.5 KB Created: 2020-04-11 09:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 99b5ac46e3e5225310029b507fc01f4b SHA-1: b33613996e663f2b7c148a01bb1f10097ace5407 SHA-256: 2ae78050a593c6475e59edbb28f008999daac3db5828dbfb0c288e540b3be708
92 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and malware distribution. The document body, though heavily obfuscated, appears to reference 'Ielts general reading practice test pdf 2017', suggesting a lure to attract users seeking study materials. The presence of a PDF_SEO_LINK_FARM heuristic firing strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://juliejesternewman.com/uploads/1/3/1/4/131409035/131409035.html#ielts+general+reading+practice+test+pdf+2017
    • http://ohcritic.com/uploads/1/3/0/5/130588799/toninesiranagu_muwegazazosas.pdf
    • http://simlash.com/uploads/1/3/0/7/130775528/vabiviwidivefomeluzu.pdf
    • http://northshorefirefund.org/uploads/1/3/0/7/130740412/ad863bfd326aea.pdf
    • http://morristem.com/uploads/1/3/0/8/130814308/ditadomewabaro-favobig-kepajan.pdf
    • http://davisdesigns307.com/uploads/1/3/0/6/130639685/7375269.pdf
    • http://udo-lindenberg-handsigniert.org/uploads/1/3/1/1/131164545/6b35e47931eeb.pdf
    • http://nuuaddition.com/uploads/1/3/0/6/130605001/9427a898.pdf
    • http://drmua.com/uploads/1/3/0/5/130541271/kozogakidak-nufosolapef-bulujurasebuzob.pdf
    • http://nextgensoftball.com/uploads/1/3/0/8/130814030/keniferokin.pdf
    • http://navingulia.info/uploads/1/3/0/6/130604476/motojupaw.pdf
    • http://vortexcoatings.com/uploads/1/3/0/7/130738944/6885486.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_off00005c6a.bin
fd8e02e45df0e9a0a7e9091dfad25cf5512ab7075bbd5467484bf9c0c8cfdfb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6A 7476 bytes

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