Malicious PDF — malware analysis report

Static analysis result for SHA-256 c539148f9b80b969…

MALICIOUS

PDF

55.5 KB Created: 2020-11-07 07:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fa3ba0fa706c46a85d640ec602cef90 SHA-1: 94add093fc544740a6b39aa1d2729063554630de SHA-256: c539148f9b80b9697e4b46bd881d1f73798e7d7ba800263bff8fdd6e1e8f39e6
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, identified by the PDF_URI heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, suggesting a link farm or SEO spamming operation. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were extracted, the overall structure and heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 https://trafffe.ru/123?keyword=fort+towson+public+schools+ok
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fa62b20a1978.pdf
    • https://zifusotoxiwi.weebly.com/uploads/1/3/4/4/134476210/fexixuk.pdf
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/893794b1eec54bb.pdf
    • https://cdn-cms.f-static.net/uploads/4469634/normal_5fa5f363b3dc7.pdf
    • https://dulexarupiwaju.weebly.com/uploads/1/3/3/9/133986428/78da8.pdf
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/3297630.pdf
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/gunodave-repidal-depimofojesupo-kukowonamu.pdf
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/lunavufakuvusiwugez.pdf
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5f8f3147e859f.pdf
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/79250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kozikixoju/stellaris_mega_engineering_research.pdf
    • https://s3.amazonaws.com/wonoti/1791731320.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000098f2.bin
703bfb775c1d58314d2b8a35a3a0d22781849a515fcf3d1b8223a2b707a61481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F2 5060 bytes
font_01_sfnt_off0000aa37.bin
da9171fdebf5f153a121f55fa8e3f552c4ea3635a792cdcc93bfba60ca3d65f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA37 12432 bytes

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