Malicious PDF — malware analysis report

Static analysis result for SHA-256 331d1c148ce0c0d0…

MALICIOUS

PDF

44.6 KB Created: 2020-10-08 07:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1fedca5320c0a0c26a7abaff53336be8 SHA-1: b016ebdbf1a646fec8346978de491a5c1dd54c5d SHA-256: 331d1c148ce0c0d05546fbf99840f987782f547bb0d0db2b83903410074bda7c
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/strik?keyword=free+shed+plans+12x16 In PDF document text
    • http://files.marsjoyofpainting.com/uploads/1/3/1/6/131606127/1986964.pdfIn PDF document text
    • http://buguzi.thejoshuaquilt.com/uploads/1/3/1/3/131383791/tatakafikokaz.pdfIn PDF document text
    • http://files.aviationfreetradezones.com/uploads/1/3/2/3/132303064/439465f58160.pdfIn PDF document text
    • http://rakin.efarsystem.com/uploads/1/3/1/4/131453850/pesenuju-zuledokekunus.pdfIn PDF document text
    • http://mexek.tagtheartgame.com/uploads/1/3/2/6/132681361/pilepox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0285/0210/files/how_did_the_kwakiutl_get_their_food.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1104/6556/files/minecraft_windows_10_edition_cheat_engine_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/lg_top_load_washing_machine_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5381/4438/files/5.2_verifying_trigonometric_identities_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8604/0228/files/rusudajosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0565/9296/files/wifawagebomenixef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/mitelaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0647/5426/files/free_psn_code_list_no_survey_or_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4564/9574/files/kawaii_potato_drawing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0776/9752/files/download_hearthstone_apk__data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4474d877-801c-406d-bd22-f8873e9d6297/wawuboludexuxefoxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a8bcb6-82bc-4235-a20a-5b05d99bf1a5/77473406246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c922f3-c908-44a9-8740-1bfd31a688da/silofomufero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf520a0-2e00-4e24-b461-cbbdeb41625c/rasinisivozupad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5a9537-9b13-4f22-a86d-5719664378e6/32961224.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_off000069c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C7 5408 bytes
SHA-256: 8a7df4dff72ad7887577e99e1a8538c20accf4098343c3b7ae6a83a2b357dac7
font_01_sfnt_off00007c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2B 12328 bytes
SHA-256: f5ed7676a35e539a0b06593a690091c4a45ee9af2220780dd9bfc4504049d1c9

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