Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a51b1ddf8b9266…

MALICIOUS

PDF

49.7 KB Created: 2020-11-02 12:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 54e0c85ab2385a5d95ce41d9e19568b0 SHA-1: be9bcc90954370573ac48f8d02557869136470c0 SHA-256: 28a51b1ddf8b9266a8cfdfc2357b278521345df38ee828f80592437c98806b55
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/aws?keyword=1965+alabama+literacy+test+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5f92c74c93b16.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/lerigokid_dunafiz_sazabovixixez.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/zepopapirenap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f870fbad8f3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5f9dfd25308a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_5f9f7b3a3cb37.pdfIn PDF document text
    • https://roguxewotare.weebly.com/uploads/1/3/4/3/134319265/wonaxanad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f8b983104287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f8800c1c36e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f8a574ea6fa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/98127004440.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/warhammer_2_dark_elves_building_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/auditoria_de_tecnologia_y_sistemas_de_informacion.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/guxiwesevazabudizajakudez.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/32833270652.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_off00007efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFA 5732 bytes
SHA-256: 97527982145a88db954ac7a77e3214a6ad4edee7331fd413ccd92c8151b56d15
font_01_sfnt_off00009285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9285 11532 bytes
SHA-256: 4fc5b07fc4639c9cdc7da6e0fef41fcdcaa37631905ec93f73accad60c230cd0

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