Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf1514fc4911754…

MALICIOUS

PDF

40.5 KB Created: 2020-10-16 10:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: c3f8c4edc846bb4a30fe09d9e21465b3 SHA-1: 51836bc3311d1604d74a298d0df0e5ef158c2f50 SHA-256: 9cf1514fc49117545db59f0931a64663dbe0c7fd2e308e8eaae8510507be42cb
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://ggtraff.ru/pify?keyword=andersen+screen+door+installation+manual In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/7922058.pdfIn PDF document text
    • https://xozanazefozi.weebly.com/uploads/1/3/0/8/130874019/d2c201.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/lifise_kamujojekal_setakafonevawib_leliledud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f87e3b58f89a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f894966160ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f894a508922a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f87710e31f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f874cbb08114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f873e0650445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8742105ce30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f893450c9190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f88f5a8bb941.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/7deebf0b-2207-46fd-8dca-8be2bc2a2f16/71088268726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c306639-913b-4bfe-93b3-24a790841d59/76010846238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86018810-2d81-4d4c-9aac-0b89d185c6e9/2122637089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09d4c15-240e-4a9e-aa9d-91e13b27797c/tupazosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0c7275-dc86-4f2f-89cd-06bc5ad5f79d/rimojezoxopowojalilegu.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_off00005fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 5072 bytes
SHA-256: 6fd9e4f781e3bfd1017befd35c86d686df249b4b49218eafe8952af5975fa9bb
font_01_sfnt_off000070c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 10888 bytes
SHA-256: 39b267b41e8fe935880d59ca0344ac04b82601e05b2631d9ff26232f81841755

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