Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c403fe9966b9dd5…

MALICIOUS

PDF

49.3 KB Created: 2020-10-17 04:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 34caddb2da8bca6cd92cbb7768359ced SHA-1: f354f26b68a3f32eff5b39ff108c3b31b6d7857b SHA-256: 9c403fe9966b9dd506858bb5d49f9c46b5b8e15b781f515f2cc67c4a70a67996
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/123?keyword=color+wheel+worksheets+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8907f4022c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8760ae5d57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f8759a1c2f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f87e51ae120a.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/dunawopalege-xuvejaju-takarorijuvina-tikumexobej.pdfIn PDF document text
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/7f5f9ec1d01f.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/1d99eae9-fa02-4e8e-b954-271d688018fc/15115098184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266c81d6-9699-43a4-8c26-6b401152a365/mefobigibulifibozid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5791996a-f701-4f39-8f65-32f4768e3f02/baldur_s_gate_enhanced_edition_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4100/4439/files/mukobaxenikotukegigu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3673/7177/files/xiluka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9548/5352/files/cpm_algebra_connections_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0441/8458/files/85753160907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1246/7106/files/rotoletuwazupamadule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/5281/7573/files/oxford_spanish_dictionary_full_4.3.069_apkdata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7718/2646/files/the_great_compromise_worksheet.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_off000081ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EE 4912 bytes
SHA-256: 951196e5e67a6fbc3a119f3182b8eb98045de492bb40aebd8d56a717ac821654
font_01_sfnt_off000092b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B9 10480 bytes
SHA-256: ef75c31dc19936480f6459fafd19f82a237759f6bfb45be9218ffaff6f447e1f

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