Malicious PDF — malware analysis report

Static analysis result for SHA-256 650bf70e06034185…

MALICIOUS

PDF

28.8 KB Created: 2020-05-17 10:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a530cbb66590969b734e9efabbf77d4b SHA-1: ceb8dbb29b60be9468816a4b07aada9c3396e069 SHA-256: 650bf70e0603418549d46e1c76b1e761997ddda7edf0f49811ac00e595618f48
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to seemingly unrelated domains and are structured as potential SEO link farms. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to drive traffic to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://adventuredanang.com/uploads/1/3/0/3/130313038/130313038.html#electricity+worksheet+pdf+grade+4
    • http://theshabbynest.com/uploads/1/3/0/4/130491356/jolitikofasijapapak.pdf
    • http://somersetfoodtrail.org/uploads/1/3/0/8/130814439/gabafojofadoz.pdf
    • http://alisondeutsch.info/uploads/1/3/0/3/130379248/vodukuduxigab.pdf
    • http://newzealandcreativespacesstudioweebley.com/uploads/1/3/0/5/130550827/ade16d.pdf
    • http://whatsyouredge.biz/uploads/1/3/1/4/131454620/69ef60bd6f0205e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048d1.bin
6b34fc00a51f73d0ca651af77331663436e9b6d7b006a4642c38a4e65641e697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48D1 9352 bytes

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