Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a11528a4e3bf7e…

MALICIOUS

PDF

42.8 KB Created: 2020-11-01 19:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-18
MD5: 54592eadf971fc0083a5810a0dcdce17 SHA-1: b022fecf62810b6bf7a73ad90dab3516d7d5c58f SHA-256: 40a11528a4e3bf7ec2b77e83e919b56864cf95e14e89c12e026dffd72a22d08f
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://ttraff.me/123?keyword=formal+operational+stage+def In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f90d3924acd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_5f935d87d0042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f93c76381003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_5f90e4a8b56b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5f9679d590490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f8ccce0db3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f89e8bddc4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f8cbfeaace88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8818de7d7b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5f99120bcbd9c.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/1/0495/6520/4636/files/desactivar_google_play_services_android_8.0.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/momapimanupesekofil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8819/9332/files/gawuta.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/download_sbi_atm_debit_card_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/filewub.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_off00006a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3B 5316 bytes
SHA-256: 3b462a063e78db808f066d7f564cfd94483e066f3405e03496340974c6628b87
font_01_sfnt_off00007c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C39 10000 bytes
SHA-256: fa5633641fd73489599bb6d94744954c0d76b215aaf962db4cb3b3d5ad67df71

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