Malicious PDF — malware analysis report

Static analysis result for SHA-256 478d86cb1e57e32c…

MALICIOUS

PDF

71.9 KB Created: 2020-04-18 04:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fad4cb98234690e2578a7e14b107af06 SHA-1: daf995e84354eac8989d40e185f9e567983e2941 SHA-256: 478d86cb1e57e32cc2b6bacd703bcac12a47aa11fbb27f9fc38aca8c56b1f677
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which appear to be part of an SEO link farm, pointing to various domains. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list. The primary attack pattern observed is the distribution of numerous external links, likely intended to manipulate search engine rankings or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://kylaconner.com/uploads/1/3/0/8/130813714/130813714.html#pierre+bourdieu+theory+of+practice+pdf
    • http://girraweendiesel.com/uploads/1/3/0/5/130539763/3a5241b6568e.pdf
    • http://alexbbw.com/uploads/1/3/0/3/130379590/cdc14d392aaa0e3.pdf
    • http://ganjagoddess.tv/uploads/1/3/1/4/131438093/xawilefijijo.pdf
    • http://metalheadsmetalwerks.com/uploads/1/3/0/7/130739964/5409991.pdf
    • http://lendobuttons.com/uploads/1/3/1/3/131383771/9253014.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_off0000f2af.bin
82fe7fc0103457cbf46d005e5a96dc05a7ce4b1b6539f38c17ba600e4a35f435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 8864 bytes

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