Malicious PDF — malware analysis report

Static analysis result for SHA-256 9444859ad3fa8e76…

MALICIOUS

PDF

30.3 KB Created: 2020-06-04 02:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228b094d95bf2f8ad089a447cec088e8 SHA-1: dfd5108963c7a25e0c0998e8b0557fecdd5f0e61 SHA-256: 9444859ad3fa8e7623cc2bc40151adf8c1be1a516f2f20047c9c09d34fed974f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The presence of multiple PDF_URI and PDF_SEO_LINK_FARM heuristics indicates a deliberate attempt to create a link farm. No scripts were extracted, but the document body and heuristics point to a redirection or content-hosting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mail.grimmplayers.com/uploads/1/3/1/3/131381352/131381352.html#troy+built+tuffy+tiller
    • http://deleswaonthebeat.com/uploads/1/3/0/6/130604044/zegugaja.pdf
    • http://fhacashout.com/uploads/1/3/0/6/130639975/libigere_mabazejegew.pdf
    • http://webdisk.lymphlight.com/uploads/1/3/0/6/130620511/6685213.pdf
    • http://sassypeach.org/uploads/1/3/0/3/130313346/dodagubixazofoxoru.pdf
    • http://neonopen.com/uploads/1/3/0/5/130588426/wexeveno-felobezogepag-regeribi-milimojaguviteb.pdf
    • http://muirsidefarm.com/uploads/1/3/1/3/131379680/xedaxef_titilixoresolos_vuvuvupupanemad_runolurufajula.pdf
    • http://filmschoolcrashcourse.com/uploads/1/3/0/8/130874039/mejimopu_dowurewamewax_vigozoto.pdf
    • http://southernoregondhhed.com/uploads/1/3/1/0/131069859/8d2bc3b49110.pdf
    • http://mail.grimmplayers.com/uploads/1/3/1/3/131381352/terms.html
    • http://mail.grimmplayers.com/uploads/1/3/1/3/131381352/dmca.html
    • http://mail.grimmplayers.com/uploads/1/3/1/3/131381352/policy.html
    • https://xexufadotafu.files.wordpress.com/2020/06/66843280368.pdf
    • https://bijozoje568648272.files.wordpress.com/2020/06/98904959821.pdf
    • https://makebor.files.wordpress.com/2020/06/74523293184.pdf
    • https://sogifefuve684083845.files.wordpress.com/2020/06/73890476618.pdf
    • https://difomanonis.files.wordpress.com/2020/06/wedanezalisemobetukek.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_off00004cc4.bin
a08009809f87e705cf444a17fac24eddb654dd8ef68159f7d41a12f05d43b25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC4 9924 bytes

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