Malicious PDF — malware analysis report

Static analysis result for SHA-256 5943f5eddb6d8feb…

MALICIOUS

PDF

37.3 KB Created: 2020-04-09 21:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 18cc180d32206c69a205c72c7309c243 SHA-1: 393c68f191a24b1bb091db4a12ba956fb130f137 SHA-256: 5943f5eddb6d8feb0a4c8f0c07a5ccb245b92eb42a185d53218e45cc482d795a
94 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO link farms. The document body text, though partially corrupted, contains a reference to 'Amnesia the dark descent serial numb', suggesting a lure to trick users into visiting these malicious sites. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to potentially harmful content.

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://kmipropertieslimited.com/uploads/1/3/0/3/130323253/130323253.html#amnesia+the+dark+descent+serial+numb
    • http://timleavervoice.com/uploads/1/3/0/2/130288762/nurudivogo_remifivi_koduramabixez.pdf
    • http://lindseyaengland.com/uploads/1/3/0/5/130540065/norezok.pdf
    • http://ee-ps.com/uploads/1/3/0/8/130874350/vimuvupagirida-venekolilax-xegapobeva.pdf
    • http://bruehol.com/uploads/1/3/0/5/130588693/a2cb44.pdf
    • http://tastyhealthyconvenientchoices.net/uploads/1/3/1/4/131438242/gazigidogafalezumul.pdf
    • http://domesticait.com/uploads/1/3/0/7/130775341/kopisakokawutajizuk.pdf
    • http://txppm.com/uploads/1/3/0/6/130604126/7661128.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_off000062ff.bin
9abd8d2754daa5548fceff660a36d65b7b2bd6410c0abf124edd20aada3bba25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 10868 bytes

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