Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f621d10734e460…

MALICIOUS

PDF

38.7 KB Created: 2020-10-08 07:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 636acde3c2c245b976c48b070d2fa041 SHA-1: 3541a80c88322857083a64d64797471ca20e21e0 SHA-256: b0f621d10734e460bb2ea0e75a9dbfa3d548b057e21cefd892b8595165faa908
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=dragon+ball+z+torrents In PDF document text
    • http://files.shannonclunierealtor.com/uploads/1/3/0/8/130874633/5571723.pdfIn PDF document text
    • http://files.elizabethandamantour.com/uploads/1/3/0/7/130739704/fubaxigifun.pdfIn PDF document text
    • http://kapevovu.truluvcockers.com/uploads/1/3/0/7/130776078/2655478.pdfIn PDF document text
    • http://wogukux.floydtribute.com/uploads/1/3/2/7/132740961/1067979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01c539c-977f-42d2-a933-1f59a9bcb1a3/komeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42bfc654-1016-4152-99fe-347b0efd1525/finuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1504a7-cbde-4255-a963-947a9f6bf6a6/49988660043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3910/4930/files/4819645238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7900cb1c-2b06-4c51-8038-9ae7a9250471/97099995963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4105d450-fc3f-4329-a698-7c7f6c3ebca6/85714257029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb479571-c0bb-4119-a1d4-5dad1052427b/banokoxatugevirof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce44e16-1072-4767-b8fa-4e81170ae147/96085500901.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB8 5040 bytes
SHA-256: 732f211d391f4ed5e708fcd1008459ba015e4680d3824f30279cae6264cdd257
font_01_sfnt_off000060f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F7 15092 bytes
SHA-256: 9641f9daeb9570b5fd7cfbfda41377bb1fcc213f7fdf0478ae35984a0a19d42f

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