Malicious PDF — malware analysis report

Static analysis result for SHA-256 50964ad2c52e2cf6…

MALICIOUS

PDF

30.7 KB Created: 2020-05-31 04:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60fa7ba1423f5cf1cae395df3d2b1d5 SHA-1: aebb064074bd8802175bb27fcf61579604f88835 SHA-256: 50964ad2c52e2cf6dc1f8876aaad200ac1707e02584ca41a9db05df74cbff26d
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms to manipulate search engine rankings or to redirect users to malicious sites. The document body, though partially corrupted, mentions 'Neighborhood leadership development program', likely a lure to entice users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://reviewmypolicy.com/uploads/1/3/1/4/131437573/131437573.html#neighborhood+leadership+development+program
    • http://mx2.stephanglietsch.com/uploads/1/3/0/6/130620755/e9c63b69af6.pdf
    • http://webmail.envisionpass.com/uploads/1/3/0/9/130969053/6ebb4fd889051.pdf
    • http://aotkbf.org/uploads/1/3/0/7/130775398/216452.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_off0000503d.bin
a335f0b7c11347fdf9c0c7aff7278d0afd6b8f91a2d26f8e7f2379f68d048163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x503D 9436 bytes

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