Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8997900049ee66…

MALICIOUS

PDF

42.0 KB Created: 2020-10-25 07:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 15d4b7a75c2186fc41b0d7025b2041b4 SHA-1: 37b450ac6ad1ca3da5557b872d56c98a33a41f55 SHA-256: 3d8997900049ee66ce8489210b7db8252475545275b370c67efb892ea7fbca56
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=handwriting+worksheets+printable+free In PDF document text
    • https://lividuxu.weebly.com/uploads/1/3/4/3/134354071/7546824.pdfIn PDF document text
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/1359779.pdfIn PDF document text
    • https://kowadesilokawu.weebly.com/uploads/1/3/4/2/134265693/dusajanepopufi_jemam_pojutidaxa.pdfIn PDF document text
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/zereb_fabasopon.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/103a76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f921562e7099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5f8baebe6521d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f8bce8d27316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/memul/problems_of_inter_ethnic_relations_in_nigeria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3690/1013/files/65696702696.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4150/4418/files/897529221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2794/6398/files/66733310977.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/86346397062.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/wing_chun_kung_fu_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/bosch_spare_parts_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/57667154513.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/depogepitezelasebovogam.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/bmi_table.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5735 5348 bytes
SHA-256: 3b2b1a0bb874129fc8d43c4754954dea7e87db254d67127716d748f2a58beb5e
font_01_sfnt_off00006961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6961 10400 bytes
SHA-256: d80e2881202f4f3376757e90436f373ccac633203cd19b6841243d89697fe6f3
font_02_sfnt_off00008cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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