Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff5432a2f4cb2e5…

MALICIOUS

PDF

33.4 KB Created: 2020-05-27 00:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79ed76fb0fab1c53fe59844dd5569f5 SHA-1: 9bdcdef5cba394c83b9908e9dde7a4998da35d89 SHA-256: aff5432a2f4cb2e5106cfa601848318588d852907881186bbf95c3afdc886ab9
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, flagged as a 'PDF_SEO_LINK_FARM'. One of these links, 'https://ttraff.com/wb?keyword=one+columbus+pl#one+columbus+pl', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.com/wb?keyword=one+columbus+pl#one+columbus+pl
    • http://padovecote.com/uploads/1/3/0/5/130589295/limafezosizetes.pdf
    • http://caneadeaselfstoragellc.net/uploads/1/3/0/9/130969184/bab79.pdf
    • http://qix-project.com/uploads/1/3/1/3/131378993/39c5a2ca25.pdf
    • http://soulretreats.org/uploads/1/3/1/6/131636764/zulibupasiji.pdf
    • https://dakemevodugu.files.wordpress.com/2020/05/3427030388.pdf
    • https://fasigozup.files.wordpress.com/2020/05/mijixezobatarus.pdf
    • https://dojujakukaj.files.wordpress.com/2020/05/38357710607.pdf
    • https://dalowojetowo.files.wordpress.com/2020/05/90438396847.pdf
    • https://vakaturisemo.files.wordpress.com/2020/05/kawufijewegupirugonaw.pdf
    • https://lanexumoj.files.wordpress.com/2020/05/kizobapidotosavejununisa.pdf
    • https://widuvupisofa124280327.files.wordpress.com/2020/05/64571876627.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_off00004919.bin
1230ba22f30255429b539b95c20261b8b0ee266b524a49d0cb5fb187fcc73624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4919 22220 bytes

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