Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1b31a652b4e26d…

MALICIOUS

PDF

36.1 KB Created: 2020-05-30 11:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaee3491efee6aa26133dba6ce3ec801 SHA-1: 57c629da81ab295eedc5f6abf2f9d11605c16108 SHA-256: ce1b31a652b4e26d3bcd1c4b83080607dd33aa9f7b3184c458ef2c5950b4557f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://saczombies.joinzombieclub.com/uploads/1/3/0/6/130639652/130639652.html#slow+and+steady+get+me+ready+pdf
    • http://hostmaster.cascadiawine.com/uploads/1/3/0/9/130969847/kisixilatal.pdf
    • http://mrsbsconsignments.com/uploads/1/3/0/6/130620401/33498848f7.pdf
    • http://fernandoslandscape.net/uploads/1/3/0/5/130588989/817cd712.pdf
    • http://sunsetradiologycenter.com/uploads/1/3/0/7/130776260/ede6d58f9ba2b98.pdf
    • http://lambeauandlouis.com/uploads/1/3/0/7/130738779/debiniwamumek-boparajasup-fadiwerul-talamikarire.pdf
    • http://cherylsterlingdesigns.com/uploads/1/3/0/9/130969042/3905242.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_off00006231.bin
b6b093229b581fef8be29e1dcf9207a02c36950753834e700d175a6cd4014c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 10520 bytes

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