Malicious PDF — malware analysis report

Static analysis result for SHA-256 8451e9a424d91fdc…

MALICIOUS

PDF

48.7 KB Created: 2020-09-30 03:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c00834257a1c87e3107b0dbddc74474e SHA-1: 6d32c7a07a9e2c415f1165a957640d89ac9846eb SHA-256: 8451e9a424d91fdc949a9e77179094ca160a74c9356928fb03d2de95517667d7
164 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=basic+english+writing+book+pdf In PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/kilirukolifizuwoje.pdfIn PDF document text
    • https://site-1037887.mozfiles.com/files/1037887/73002941532.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/kovutofirosijagabuvul.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/zidisadaluzarugegaxi.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/89401835415.pdfIn PDF document text
    • http://punuvaza.gabrielaalbanhidalgo.com/uploads/1/3/1/4/131407736/b3a6e1a.pdfIn PDF document text
    • http://zurep.forestlakescounseling.com/uploads/1/3/1/8/131872055/mupezojijusepagana.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/7c906a09-798a-4a8f-a315-332990ed64ab/jiloliseka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52382a54-354e-44b9-95d0-fd47219f76aa/jabutedogedofanezibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a405d5-a87d-4dd6-bac7-f82cdd20f4c9/nanalovozuwiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89e514b-1649-4bcf-8960-4ab0d50c8ee4/20877280091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc662f1-b1ac-480f-817c-77b94eceef7f/5222296791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcaba72d-d2f2-46a1-9cc9-72ef0f18765f/93265563243.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_off00008010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8010 5760 bytes
SHA-256: 8d93131aeb1ddfd7fb23e31d31115f83b72eb4709b2f54925f588ec31e8385c9
font_01_sfnt_off000093b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B3 10116 bytes
SHA-256: e8ffa79f99b80c9b60d17928da5f60e34a16d381a8ac674563312c5ec6ed6f89

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