Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df4370eb9cb2af3…

MALICIOUS

PDF

44.7 KB Created: 2020-10-27 21:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f8d9079c09f9be72613388973a8898c9 SHA-1: 13d59a645daf35fa4d03075c0bd6b6db3f5978eb SHA-256: 6df4370eb9cb2af3089536aad5cf0d405d2a00504eaf101544df8a91f932067e
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=samsung%20sound+%20hw-ms650%203.0%20all-in-one%20sound%20bar%20manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f87b97cdcc49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f9010b776849.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/sepawi/absalom_absalom_full_text.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/jezefewezosazu.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/wibudorefasaxubot.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/72016197987.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/2019_calendar_2020_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/37486789963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bd0c8a-e3b1-46bd-8e77-41b405416b41/21487519857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8c83d9-e065-424d-a572-ee274d0c043d/55088677658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c432c7-9a2c-4b0e-a451-328372593f59/90872469482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fda9e6-53ad-4808-b703-b034e68e2e03/war_dragons_breeding_guide_2018_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16d7484a-657b-45ca-9223-161a43a13c38/10783857663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc38f52-8290-4b0c-b671-0b4f7360499f/wamegaxelarizip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6edc586f-5748-4ac4-b75d-f3a076f01d4f/23968329179.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/biology_notes_for_class_10_icse.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/gate_preparation_books_for_computer_science.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/newifa.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/surface_area_of_rectangular_pyramid_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_off00006c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C36 6224 bytes
SHA-256: 2cd2c175080ad24d675a5194129c2150d971bf815064a1034c8555d7c9273bde
font_01_sfnt_off0000813b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x813B 10560 bytes
SHA-256: f796cfb04a85e304aebf796999ae572aa3f000a7bcaf936f20e2f0f6e7b19e18

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