Malicious PDF — malware analysis report

Static analysis result for SHA-256 e187b9560ca3d432…

MALICIOUS

PDF

42.4 KB Created: 2020-04-03 16:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12279a9bebf72fcce09bfec32c6801b5 SHA-1: 2233f6d9553e57d7558a7404b48b15ee290552ca SHA-256: e187b9560ca3d4326b53b1ad70f0af0aa1da44d17eaf7d27b0723d9fd8301798
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a piano song tutorial. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The primary attack pattern involves luring users to external sites, likely for phishing or malware delivery.

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://yourluckycharms.com/uploads/1/3/1/3/131398561/131398561.html#beautiful+piano+song+to+learn
    • http://mariselacassandra.com/uploads/1/3/0/5/130551427/mebisebora.pdf
    • http://daintreeonline.com/uploads/1/3/0/2/130270785/5126398.pdf
    • http://secretdiaryofanycgirl.com/uploads/1/3/0/3/130379297/13a0bb366b7.pdf
    • http://divideandculture.com/uploads/1/3/0/6/130639141/aa3b5a8d3.pdf
    • http://slysit.com/uploads/1/3/0/2/130289163/monesoke.pdf
    • http://kranz7science.com/uploads/1/3/0/5/130588944/5e30b.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_off00007d2a.bin
bf22bf6ee0601510b52c84567159f5d90916d07f3ea8a5abad00c044b12a388c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2A 7996 bytes

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