Malicious PDF — malware analysis report

Static analysis result for SHA-256 6544aa3de55b7e0e…

MALICIOUS

PDF

41.7 KB Created: 2020-10-02 22:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 255de4724e26b54b1d7b92311bc60a13 SHA-1: 6ca0453a064ee04ecf40005b435ff5b4b4d87b65 SHA-256: 6544aa3de55b7e0e4fefa2d4ec2fde47bde8f51016afc14ccaf3692ae7fdadda
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://gettraff.ru/strik?keyword=mortal+kombat+x+all+characters+unlocked+apk In PDF document text
    • http://files.theygavetheirtoday.com/uploads/1/3/0/7/130775917/9146111.pdfIn PDF document text
    • http://files.fmmii.org/uploads/1/3/1/8/131856065/femiguwifomeb-mifuvipanalat-nenugovusexiriv.pdfIn PDF document text
    • https://site-1040125.mozfiles.com/files/1040125/49963055045.pdfIn PDF document text
    • https://site-1041288.mozfiles.com/files/1041288/debopogoribefewedonu.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/dc5f356b-cf9f-464b-af60-8555b2db6ef4/sanigajiximutifex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe9ca50-f992-48f4-bb1d-936f61c1115b/tevedawakoguduribagef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0eccef-0dbc-4693-b730-3b890aca7c98/vopiwuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e358bb91-57d4-40a7-90f8-5f90b7d14c52/burodabapepow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd26a3d0-0bd5-4513-aace-05d7c1a36d60/gobapararalafoxajepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2e9b01-11c0-45ad-bf1f-b8fd8b9ea4f3/56282639747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e641e755-68ba-4c0b-b63b-0bfa9fbd0772/28552306291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488a335b-6327-44f0-beb8-bacd567f3908/98231118196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf38875-279d-4710-96e8-f59ef765a1a3/ramadusavesorusoketotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf3fad9-cd9f-4786-9faf-a63ad96b69ad/22953070086.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_off00006351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6351 5592 bytes
SHA-256: e922b45282d4d33dec177f7ba8ff8137c108f9dc669da07c021efdb3df937435
font_01_sfnt_off0000762e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 10516 bytes
SHA-256: 1eef5ea55d67f6cc9877eb036d39f9099da5e2620c6a29ac52bdcc6a120d1d77

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