Malicious PDF — malware analysis report

Static analysis result for SHA-256 add05bbfbdfcfede…

MALICIOUS

PDF

46.0 KB Created: 2020-11-05 03:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: f9e5e0e9fce7a009afd7c710573d82ad SHA-1: 2ba28f9f05c655ffbe306e59f9d9604709a80dcd SHA-256: add05bbfbdfcfedec63f700108e2c97ddce3fab8e1a67adc0037966f25d44c18
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=holt+physics+section+review+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5f9ff43534919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f9573bdd80f4.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/wizedumi/muwilupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c32c8d-8490-4c19-a5c8-c0b0268c6524/15498547359.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/belojuf.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/toxuxokomuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1083/2574/files/sat_practice_test_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/46935139344.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1124/3672/files/eufora_aloe_therapy_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/busomoman.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/types_of_verbal_and_non_verbal_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c616f7f1-595e-4b8a-ab1d-eb3845b160df/40198054428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a528788-2acd-4a6d-9301-c129b578b538/wofaxojozowifukudulimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89674861-112a-48bd-9b34-31f6c8e4cd15/vexelavu.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/minecraft_towers_and_castles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7d379b-a51e-4848-b25e-cf4fb2307ea6/singer_fashion_mate_360_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/cs_go_pro_players_setup.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_off00007405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7405 5300 bytes
SHA-256: 7c87f588d9521ba9b7d3d3465e4302239dda6e3306a34b1024bb155b32592fd2
font_01_sfnt_off0000861d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861D 10752 bytes
SHA-256: 72dd69a64aefb19e183979486302a76a4b221fa204c7d334b7230a6c42baa180

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