Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedf531ef98b1d3a…

MALICIOUS

PDF

35.5 KB Created: 2020-06-23 12:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e5cb2a9ceb839f3105cdcea095f0ab6 SHA-1: acbbc05858e25e67a68bf714b0027af3121cdc6f SHA-256: aedf531ef98b1d3ae7f2176925aa69ca7d433a4d12c985a92c8ac495b5f6479a
94 Risk Score

Malware Insights

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

This PDF document was identified as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to the URLs, indicating an attempt to direct users to these external resources. The primary intent appears to be driving traffic to a network of potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://biofieldtuningnj.com/uploads/1/3/0/2/130289640/130289640.html#christian+movie+discussion+guides
    • http://2sx.undesirable.us/uploads/1/3/0/7/130776370/418756.pdf
    • http://fourfive.org/uploads/1/3/0/2/130288386/2844721.pdf
    • http://northtownsound.com/uploads/1/3/0/5/130588778/5589235.pdf
    • http://secure.agorapublications.com/uploads/1/3/0/6/130621664/rabasudamiw.pdf
    • http://melbournerealestatesales.com/uploads/1/3/0/6/130604509/7207841.pdf
    • http://themightofmotherrussia.com/uploads/1/3/1/4/131407876/38e8e.pdf
    • http://nskz-hq.net/uploads/1/3/0/6/130639024/kividawakob.pdf
    • http://evolveequality.org/uploads/1/3/0/8/130813511/423c2ebc9e63.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d5e.bin
1a2552ce1beeee514b11b1722db26a11f5855f871256c162ba665c4e14f5cbea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5E 5288 bytes
font_01_sfnt_off00005f2e.bin
fcc63f1ba500303ac56a5ca4892abbb3c96fba0949bae7e32878793c4a1e7341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2E 10252 bytes

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