Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5b528ac92f6a0e…

MALICIOUS

PDF

41.0 KB Created: 2020-10-09 23:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f829e544670251991acc5961dfdb1a78 SHA-1: 2778296f0b9bb36325421ed93b14a3cee09b1c64 SHA-256: 3b5b528ac92f6a0e28753b9604d9c40229728599b3056407fbc22b036a44d092
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://gettraff.ru/strik?keyword=butler+artemis+fowl+description In PDF document text
    • http://xuwalev.terryshistory.com/uploads/1/3/1/4/131438641/fusigelug-wemirof-gafudikum.pdfIn PDF document text
    • http://files.ngcym.org/uploads/1/3/1/3/131379296/3f51a5fbc56.pdfIn PDF document text
    • http://files.alamoheightstheatre.com/uploads/1/3/0/8/130813314/667cb.pdfIn PDF document text
    • http://kanonak.clemsongammaphi.com/uploads/1/3/1/3/131380351/1267931.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/1ce58763-649c-4381-8822-b0261a9dbad2/nuzujolam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b404624-3afa-4e98-b4e7-bf6ab81d6fd9/kuxuromuwekatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66a1e01-2891-4960-883b-1da81f6de517/89830631080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d3e01a-bc07-4972-877f-5ef74f4fea2e/pibumawanorepomanabevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920d5d41-436d-4e30-b2c3-1fe5a9942dbb/wibuluzufexokikuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4852/0866/files/89462645333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4793/9996/files/cuckoo_clock_sound.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/la_causerie_francaise_kansas_city_mo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7503/3505/files/wufaripirotu.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_off000062c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 5444 bytes
SHA-256: 0297e458d660b2bae08a9a032e3811221937110d6ebfd8f4da50d088206023ef
font_01_sfnt_off00007545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7545 9988 bytes
SHA-256: 706f7f139a6c3da7858112a351a013dca55f52b3b7343a3d0a83f9c759e3f7d5

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