Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6c63db0072c0b5…

MALICIOUS

PDF

28.8 KB Created: 2020-04-23 03:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b585f32a2b329e210ae88725a8a6e04 SHA-1: 898388b5dbee2215f90a9eef83970b446e3f11fc SHA-256: 9f6c63db0072c0b57407d94ce6878cfcf53d67471a6011f9f84039eb72a2d74a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, indicative of a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting the document is designed to funnel users to a network of sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive linking pattern points towards a delivery or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sostlouisflavoredpickles.org/uploads/1/3/0/2/130289493/130289493.html#although+however+exercises+pdf
    • http://utahincident.com/uploads/1/3/0/8/130813612/868bd74d659.pdf
    • http://fifteen01.com/uploads/1/3/1/3/131384135/a79068.pdf
    • http://bestexcel.net/uploads/1/3/0/6/130604061/c07a0dc084.pdf
    • http://ramonproductions.com/uploads/1/3/0/5/130544110/gilixatozideluxa.pdf
    • http://humboldtbrandstracts.com/uploads/1/3/0/3/130379121/e530b7b76283cd.pdf
    • http://sandyknauermorgan.com/uploads/1/3/0/7/130738949/suwav.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_off00004bc2.bin
90f3b9ff4b16304af51fce85a46c7bb9790cb07a11832fbd748abf73f98099e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC2 6536 bytes

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