Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6f3728b40ec9c6…

MALICIOUS

PDF

46.6 KB Created: 2020-03-26 11:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bc6641c2d9e95ad2d80709996d1a7518 SHA-1: 59c8d561e9e0f3e20355cd9339e78b3f0476341a SHA-256: 5a6f3728b40ec9c699ec541fb9968328df1e89b8c9c6fcd2475b106de710794d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many with numeric slugs, indicative of a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a movie. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful content.

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://atlantas-premier.com/uploads/1/3/0/6/130639655/130639655.html#le+petit+nicolas+movie+in+french
    • http://barentsenadvisory.com/uploads/1/3/0/6/130639569/tevekiripusas.pdf
    • http://klgovaffairs.com/uploads/1/3/0/6/130604749/bavexebipuduka.pdf
    • http://shutupimgay.com/uploads/1/3/0/6/130604585/muwedaf.pdf
    • http://rabbitmountainlavender.com/uploads/1/3/0/5/130588389/vepezaboxi-sozabozuwow-logifudipuvik-kuwitujolima.pdf
    • http://mail.wintercutlery.com/uploads/1/3/0/5/130589019/d4e5869e492.pdf
    • http://michaeldietze.net/uploads/1/3/0/6/130604987/9741907.pdf
    • http://www.primeeliteteam.com/uploads/1/3/0/5/130542982/125f62.pdf
    • http://menoqunubu.com/uploads/1/3/0/6/130620340/88ca1fcc.pdf
    • http://rioverdeconstruction.com/uploads/1/3/0/6/130621942/letazoviduperuvebo.pdf
    • http://www.puttylove.com/uploads/1/3/0/2/130292110/zalujarig_mifilawize_zulubipapa_munokuluw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008220.bin
eba668765b6d77e99780a4e8bfe16b370ab4b77ee16421d723956aa12346c483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8220 9416 bytes
font_01_sfnt_off0000a3f9.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F9 2616 bytes

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