Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbdf6cc1e05a4fd…

MALICIOUS

PDF

78.9 KB Created: 2020-04-07 19:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f58fdae7d0d49cc95c84b3c1cc0e4362 SHA-1: 0ae794cd0508fd596ad20b85f58e34ece86ce340 SHA-256: ecbdf6cc1e05a4fdb11a542cbb56082bbfb6ff70a15e7c3d4c4280440d19ce9a
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs on different domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern appears to be directing users to a network of SEO-optimized PDF files, likely for malicious redirection or content hosting.

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://hope4ken.com/uploads/1/3/0/6/130639285/130639285.html#obtencion+de+datos+estadisticos
    • http://minarets-medical.org/uploads/1/3/0/9/130969308/07e6dbb0be35303.pdf
    • http://kivulove.org/uploads/1/3/0/2/130289305/4128814.pdf
    • http://childrenshospitalchildcarecentre.com/uploads/1/3/0/4/130488286/zuxapukezonufol-gafiwupopumuv-kojadanebodigok-zanusi.pdf
    • http://jandwrestaurants.com/uploads/1/3/0/5/130543366/4e43b405d2.pdf
    • http://partyjumpersrentals.com/uploads/1/3/0/8/130814238/3963477.pdf
    • http://naconsult.org/uploads/1/3/0/6/130605146/9557490.pdf
    • http://dementiapartnership.com/uploads/1/3/0/5/130588845/6624248.pdf
    • http://wrestlingbearsmag.com/uploads/1/3/0/6/130603731/a24ab18.pdf
    • http://good2goca.com/uploads/1/3/1/4/131453177/rigujenabobefaxiga.pdf
    • http://performyourbestsportsmassage.com/uploads/1/3/0/3/130379803/3b77839.pdf
    • http://adcimportanddistribution.com/uploads/1/3/0/7/130738576/zizetize.pdf
    • http://ben-franklin-quotes.com/uploads/1/3/0/4/130435706/00a7504e6dff.pdf
    • http://haircandysalonoc.com/uploads/1/3/1/4/131453679/4723b8ba.pdf
    • http://austinandmolly.com/uploads/1/3/0/5/130590664/gobaginen.pdf
    • http://simonheptinstall.com/uploads/1/3/0/9/130969923/kifowe-kaxafizefoze.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_off00010dc8.bin
cc5ee3af398b30fba8a765018881c6cff0b9e2d5c7feec481525ce0351b46d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 9124 bytes

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