Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8d334687944de6…

MALICIOUS

PDF

30.2 KB Created: 2020-06-01 14:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2135d1eb010ecdc5d8b1a3c85fb19186 SHA-1: a1b4878bf3013a179d94b9cbf903aed3bf30633e SHA-256: dc8d334687944de6fcf1cf1605aa01cac36d1a8e32237acf8857962d66d48af2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially obfuscated, contains references to these URLs, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external sites.

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://theglitterychick.com/uploads/1/3/0/6/130620667/130620667.html#pokemon+stadium+2+rom+for+n64+emulat
    • http://koinlando.com/uploads/1/3/0/5/130590122/gojawaposurupe_jonuvok.pdf
    • http://hostmaster.bensan.it/uploads/1/3/1/4/131406837/930b121adea.pdf
    • http://bombshelltattooremoval.com/uploads/1/3/1/4/131453133/cfc277a.pdf
    • http://dentalhomegeorgia.com/uploads/1/3/0/5/130588508/nuvefejojefosedikif.pdf
    • http://tools.picturemeonthis.biz/uploads/1/3/1/3/131379054/702c76c.pdf
    • http://christiesmworld.com/uploads/1/3/0/9/130969983/46a706.pdf
    • http://losangelesswingsetrelocation.com/uploads/1/3/0/8/130813582/1020815.pdf
    • http://countrydollhouse.com/uploads/1/3/1/4/131408209/5809366.pdf
    • http://ssrsltd.co.uk/uploads/1/3/0/6/130604232/6331860.pdf
    • http://http//theglitterychick.com/uploads/1/3/0/6/130620667/terms.html
    • http://http//theglitterychick.com/uploads/1/3/0/6/130620667/dmca.html
    • http://http//theglitterychick.com/uploads/1/3/0/6/130620667/policy.html
    • https://gebikotonogu.files.wordpress.com/2020/05/5753349382.pdf
    • https://dajejunej.files.wordpress.com/2020/05/nujokixafozigopob.pdf
    • https://gavadopojame.files.wordpress.com/2020/05/61030111617.pdf
    • https://kexunezelip.files.wordpress.com/2020/05/58891705023.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_off00004c1f.bin
f60a80e89b03214a2625377f05f838fc86e691e63ea5d8122a97c7cdca4d4fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1F 9652 bytes

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