Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a21de4a52f273f…

MALICIOUS

PDF

42.4 KB Created: 2020-04-14 21:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32300cc82882d0763fdf16a7321afa83 SHA-1: caee6efefbb8ff77c94e1c39f9d864c619b18f1e SHA-256: 50a21de4a52f273fe4fc82fc458651fd4e9d7496f29acd27a532ad70d85d3fbd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 External Remote Services T1204 User Execution

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various domains, suggesting a link farm or redirection scheme designed to lure users to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ablehorsewomanship.com/uploads/1/3/0/5/130588999/130588999.html#background+music++free+instrumental
    • http://okomesushibento.com/uploads/1/3/1/4/131407944/noxutegim.pdf
    • http://sakelectric.com/uploads/1/3/0/6/130621128/dexofas-wezerezuvus.pdf
    • http://pureoptical.net/uploads/1/3/1/4/131438640/jixotuliwuves-bokepimorip-beruzip.pdf
    • http://horizonsksu.com/uploads/1/3/0/4/130483273/ad19f813eb09c.pdf
    • http://burchlangstaff.com/uploads/1/3/0/4/130488619/tafizimawilinodikofe.pdf
    • http://golfferdir.net/uploads/1/3/0/6/130639899/madikapemesi_xolugavibaraf.pdf
    • http://blackjade.club/uploads/1/3/0/5/130539659/8157098.pdf
    • http://blackjade.club/uploads/1/3/
    • 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_off00007f71.bin
cfdc4552e918ee60814da41111a81060b2c428e9af5d72724140e290dea73176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F71 7804 bytes

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