Malicious PDF — malware analysis report

Static analysis result for SHA-256 c479e44320a0c193…

MALICIOUS

PDF

38.1 KB Created: 2020-03-21 14:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b786fb3bbfeb344ee53bf82b0d93c293 SHA-1: cbddf9daef41a222683984de4ceeee73580d1457 SHA-256: c479e44320a0c1938372f2e1f65472a850a6b8f9675f6a5841ab88b63a32a367
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to URLs that point to various domains. This suggests the primary purpose is to redirect users to a link farm, potentially for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted from this sample.

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://rochecenter.org/uploads/1/3/1/0/131071191/131071191.html#libro+la+perla+capitulo+2+resumen
    • http://pointexchange.co.za/uploads/1/3/0/2/130289294/nadokarumisalas.pdf
    • http://quiltsbyraggdolly.com/uploads/1/3/0/4/130488311/f98d0b82.pdf
    • http://sgrahamdesign.com/uploads/1/3/0/3/130323175/8fa9b4.pdf
    • http://www.missionsnola.com/uploads/1/3/0/5/130588203/aebdafc7a9.pdf
    • http://wildvalleychocolate.com/uploads/1/3/0/3/130323092/nupenadezoban.pdf
    • http://mattkingsbury.org/uploads/1/3/0/8/130814562/3294072.pdf
    • http://fearlessvisionmarketing.org/uploads/1/3/0/7/130739095/lilewemimuxexumi.pdf
    • http://spreadscience.org/uploads/1/3/0/4/130490584/tutebijekowunavolo.pdf
    • http://crookdlense.com/uploads/1/3/0/3/130313194/xutunof.pdf
    • http://armandohome.com/uploads/1/3/0/7/130775879/4965995.pdf
    • http://mta-sts.leedokyun.com/uploads/1/3/0/6/130604656/resawuti.pdf
    • http://annaburova.ru/uploads/1/3/1/0/131069961/634a8.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_off00006c47.bin
0615cde7386ca69b74580624046e32a9e4ae1b85ca078cd9a7dd935ebb6f2bfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C47 8752 bytes

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