Malicious PDF — malware analysis report

Static analysis result for SHA-256 f976eb3264acf0fd…

MALICIOUS

PDF

106.8 KB Created: 2020-06-03 13:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f001b6923dde80d9d61793b053476c5c SHA-1: 3131deccea041653762bf7e9cd03806a7b289161 SHA-256: f976eb3264acf0fd8f629a77b02b7424a876b73eb398861126ced148b66824cf
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to artificially boost search engine rankings. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading ROMs. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://survey.rodhillportraits.com/uploads/1/3/1/8/131856433/131856433.html#all+nes+roms+download
    • http://a-plus-medical-supplies.com/uploads/1/3/1/3/131380480/mavefekokig.pdf
    • http://saultlittleleague.com/uploads/1/3/0/5/130539658/8941270.pdf
    • http://zionstonecompany.com/uploads/1/3/0/9/130969633/dosavilo.pdf
    • http://survey.rodhillportraits.com/uploads/1/3/1/8/131856433/terms.html
    • http://survey.rodhillportraits.com/uploads/1/3/1/8/131856433/dmca.html
    • http://survey.rodhillportraits.com/uploads/1/3/1/8/131856433/policy.html
    • https://suxeniruwip.files.wordpress.com/2020/05/muberupadizusali.pdf
    • https://suxeniruwip.files.wordpress.com/2020/05/paguxokajinexasepakeb.pdf
    • https://ziwamol.files.wordpress.com/2020/06/guvalagibevixinasetulukow.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_off00017abd.bin
589ea0d2016d486cc31fe8b2c9a41d475b3d37a1212c6c84d5c215f34989874d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABD 10916 bytes

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