Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9838ada93e285c…

MALICIOUS

PDF

54.5 KB Created: 2020-10-31 14:35:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b56fb77f5cda8d7f4db30d8f82caa18c SHA-1: 59967f708f9344df6a229c99ad2cf62a6d486ecb SHA-256: 9c9838ada93e285c60cbf0536dcdf354ecc0ae8c94fcf626207608b71cba1074
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/aws?keyword=the+revenant+book+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f8cf5b028a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5f9708fc9f160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f9c9be0bfd11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f9cf10ee1863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f8d2de672f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f8df36889070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f8b7b37598d0.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/04c4a7e4-25ca-4da5-a51d-ce87a89b52a3/zemobejitavewezonumibajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8182/1088/files/bulitusezevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3d9f9e-94d2-470b-9bb5-faee033c5456/favotatodiloromupolare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2325f4d8-2997-43c0-b74a-8443fa5f5ced/holt_mcdougal_explorations_in_core_math_grade_7_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4968/0032/files/read_batman_death_of_the_family.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a302.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA302 24516 bytes
SHA-256: d1edf007a611b4b6ab533886d781cbc7c7817f949d6200c462882944d89aca66
font_00_sfnt_off000066a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A9 5256 bytes
SHA-256: 5168c3ffd3960590742425955cb42dd14296c2123f5648e1581eb832d1fe433e
font_01_sfnt_off00007894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7894 13008 bytes
SHA-256: 33fa3e9306dd3597298ccbe21e57bd00ccbbc05011020d67e82c21c841e56a46

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