Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b41f16b2eae840…

MALICIOUS

PDF

44.8 KB Created: 2020-04-19 17:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b6cadeb830b35ca8e39f57dd7bba2bc9 SHA-1: b31447947a665f54de151d1a046c7a1a1580c55b SHA-256: 09b41f16b2eae840a9fce78353a3ecaac392f24e64b09813893a596bb1b9e681
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, disguised as a cheat sheet for 'Gta 5 san andreas cheats'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these external links, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://financecolab.com/uploads/1/3/0/4/130435751/130435751.html#gta+5+san+andreas+cheats
    • http://mirrorupgrades.com/uploads/1/3/0/2/130288552/sukex.pdf
    • http://aspaceoddity.co.uk/uploads/1/3/1/4/131454304/4f8c17b.pdf
    • http://nkbassetmanagement.com/uploads/1/3/0/6/130620538/dizaripebamijunadeno.pdf
    • http://glassifiedglassstudio.com/uploads/1/3/1/0/131070340/4755752.pdf
    • http://brmarkgregory.com/uploads/1/3/0/6/130604858/05e1c9edf9d1702.pdf
    • http://azconsulting.org/uploads/1/3/1/3/131380651/9cadfd.pdf
    • http://opendorrkitchen.com/uploads/1/3/1/4/131438495/negobasobexo.pdf
    • http://chivoremeralds.org/uploads/1/3/0/6/130621909/7016fbc8abda072.pdf
    • http://haulawayremovals.com/uploads/1/3/0/7/130776712/suvisiwozikuj.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_off0000865c.bin
afa8eedf73a9b1a79037d253c31b1d7d5e95c981e234a0e7d8c67cfee7db5dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865C 8684 bytes

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