Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bbd2fcfaf8f76d…

MALICIOUS

PDF

39.4 KB Created: 2020-04-05 07:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d59f3c775380abec4d94aaa7552b2a8f SHA-1: f0fd98685995474e7d9caa202cb5b458642fe38e SHA-256: b8bbd2fcfaf8f76d665fb99f616149b2e36abb6a73700ca6d28c467a013f96bf
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Como hacer tallo y hoja con decimales' and references the wkhtmltopdf tool, suggesting a lure or obfuscation technique. The primary attack pattern involves redirecting users to a multitude of external PDF files, likely for SEO spam or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://youbrewchicago.com/uploads/1/3/0/9/130969681/130969681.html#como+hacer+tallo+y+hoja+con+decimales
    • http://sharingsomethoughts.blog/uploads/1/3/0/2/130272505/duwufopegamovubupok.pdf
    • http://jellyjuke.com/uploads/1/3/0/8/130874018/lixapimoweropim-sagafo-jotanoni-viwikun.pdf
    • http://familyandchildrenscenter.org/uploads/1/3/1/3/131379894/6308536.pdf
    • http://chicagodatacenterrealestate.com/uploads/1/3/0/6/130620410/vuwodugifav-kepajidudixa-batakopado.pdf
    • http://oud-over.com/uploads/1/3/0/6/130621477/79593bed4c6.pdf
    • http://northtexasrvresort.com/uploads/1/3/0/6/130605448/rafabefuvezejebesu.pdf
    • http://quartersawnhomes.com/uploads/1/3/0/6/130604093/vagiti.pdf
    • http://thelifeofleela.com/uploads/1/3/1/3/131398491/juseg-tukupono-bobufobumaj-nuzani.pdf
    • http://wbr7b8hju8.butterfly520.com/uploads/1/3/0/8/130873947/d64cc4c71.pdf
    • http://damantrans.com/uploads/1/3/0/6/130640081/225b302d420.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_off000062ae.bin
3c221c82170965c1c36c7299114c59d9bc9865925ee95d34f1d8ad8351284977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AE 8380 bytes
font_01_sfnt_off00008189.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8189 4144 bytes

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