Malicious PDF — malware analysis report

Static analysis result for SHA-256 b287b0f64ba8e43a…

MALICIOUS

PDF

43.6 KB Created: 2020-05-30 20:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f588b3f6b681eab9e92a25a1cd5079 SHA-1: 93dddd5be00b05c751dae45892fbe6c0e4651b47 SHA-256: b287b0f64ba8e43aedb69ec7e3176098943fb01c597fa0be624448c1b2e42e0d
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, suggests a lure related to 'special right triangles worksheet answers'. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially malicious content hosted on these external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9665

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://oldwoostore.devsite-1.com/uploads/1/3/0/5/130543848/130543848.html#5.8+special+right+triangles+worksheet+answers+with+work
    • http://mdsvault.com/uploads/1/3/0/5/130550848/kanokorisuda.pdf
    • http://metaldetectingshow.co.uk/uploads/1/3/0/8/130814716/sonof-gakumesomitek-pitalekelifor-xovutalumo.pdf
    • http://iceboxskincare.com/uploads/1/3/1/0/131071240/bedipegejix.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_off000066c3.bin
8c5f9903ac278e76ac1ad9427baca3ea8a627cf7342d9d63132452a3bd56eb7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C3 11428 bytes
font_01_sfnt_off00008dda.bin
836ab3fafa1d23e35e14e192ec86be8fe8e931eee4b8c79d5c7bf23088570f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDA 16136 bytes

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