Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d02cff14afcc57…

MALICIOUS

PDF

51.1 KB Created: 2020-04-13 20:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ba641a0b5a82e27ef755dcfa051de0af SHA-1: 0c286c0de1f6a7a89e2b49e8ba9a3db165d2ce5d SHA-256: 08d02cff14afcc572d84d44f49bf7a48d954b8ed47dc945562b16749a6fa3594
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-like structures or PDF files on unrelated domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm or redirection scheme. No scripts were extracted, but the presence of many external URIs suggests a potential for further malicious activity or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://grambogames.com/uploads/1/3/1/6/131606208/131606208.html#housed+stringer+template
    • http://noreymetalart.com/uploads/1/3/0/6/130604638/2270195.pdf
    • http://termlimitspompano.com/uploads/1/3/1/4/131407117/a5231f0647d4b.pdf
    • http://deweycolorrun.com/uploads/1/3/0/8/130873880/leduwigo.pdf
    • http://bureau-lemniscaat.net/uploads/1/3/1/3/131380973/dugatekugenuguralul.pdf
    • http://gimlitechnology.com/uploads/1/3/1/3/131379280/c57ac5e753fe52.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008717.bin
14db6c25d02d2c599e56f0e982c4fb3a1b95f04707f76b18beb31742a0da3a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8717 9720 bytes
font_01_sfnt_off0000abe4.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABE4 16036 bytes

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