Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4e2f1920cd5335…

MALICIOUS

PDF

38.5 KB Created: 2020-09-30 11:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 1dc81bb8f771516038afa930cc057a5b SHA-1: d563859a505b31a4a32d3af483185f09d1f465a6 SHA-256: ab4e2f1920cd53358a532de1a56b90146e0e305712de5776d625ad981ffc7663
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://cctraff.ru/strik?keyword=kti+bronkopneumonia+pada+anak+pdf In PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/xevegirinimefuxoragedovad.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/nelefuribijukipunefonixuj.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/433907730.pdfIn PDF document text
    • http://dolin.openedge.org.uk/uploads/1/3/0/7/130776644/6239459.pdfIn PDF document text
    • http://ridijit.sjeliz.org/uploads/1/3/2/7/132740214/837944.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/5443/1139/files/android_developer_mode_security_risk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3668/9820/files/92350119258.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0188/7136/files/befikre_song_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3809/7051/files/graphical_user_interface_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d439e8c6-9d99-4bec-aa55-7c893812b6ef/83711100208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe7c04b-aa17-4127-b1de-dfbe6da1c794/69570549104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43aea424-b9cf-4266-824d-4510d2baf2fb/rujul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297ea9d7-763f-48d5-a3d1-4465bfafdbcc/17458400020.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58FE 5152 bytes
SHA-256: 5c67636409f76e22e49f5ae646edd4f58889a606f87b81a603e1b3bab01c3eda
font_01_sfnt_off00006a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A67 10276 bytes
SHA-256: 5d95a52aa64c8d859ac470baf672f75baa8e01f63eb300cff817f14d37d44ed2

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