Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fb7be81f071f35…

MALICIOUS

PDF

42.6 KB Created: 2020-10-02 15:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b2291092e19ba94d0055de16018a7d54 SHA-1: 720d9966e7debf3da8f33c7d53bb7758d76d3478 SHA-256: a8fb7be81f071f354b4df1d3c8ae74c08ffbfb2d7afea7ec32094f91f0afe8f0
184 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.
  • 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=realtek+rtl8811au+wireless+lan+802.1 In PDF document text
    • http://files.topcosmeticgyn.com/uploads/1/3/1/4/131406288/vilizo.pdfIn PDF document text
    • http://files.wardingtonintl.com/uploads/1/3/1/1/131164557/5593103.pdfIn PDF document text
    • http://files.florinsquare.com/uploads/1/3/1/4/131437722/zevebovufew.pdfIn PDF document text
    • http://files.weinerelementary.org/uploads/1/3/1/3/131383837/5338618.pdfIn PDF document text
    • http://files.chapeltownfootclinic.co.uk/uploads/1/3/0/7/130740517/kanusadefa-defun-mikimowerenal-jidop.pdfIn PDF document text
    • http://suleb.bridgeartsproject.com/uploads/1/3/1/3/131380429/vusuxigobekexezar.pdfIn PDF document text
    • http://jugibe.penascoliving.com/uploads/1/3/0/7/130739081/2a55c5ea1.pdfIn PDF document text
    • http://vamukor.csanetworkausnz.org/uploads/1/3/1/4/131483128/gamamidoz_xotakabag_bilefo_rorep.pdfIn PDF document text
    • http://losepux.amybloustinecoaching.com/uploads/1/3/1/4/131407995/065f857ce9.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/1/0463/0701/6866/files/haynes_auto_repair_manuals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/senso_activbuds_s-250_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1062/3141/files/40580999422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e5be50-a2cf-4321-8030-1611601637e9/32092435146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032a39bd-054c-495b-919d-df665bb0f8c6/217793688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c7e8af-eddc-4322-989c-7b51ed380d5c/gekameniluzirezejuxom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b841303-e0c4-4f7d-b9e1-cd8d784053c4/rokipumodad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88386a18-ab4d-4724-bce6-c0ff6c3438eb/8467969163.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_off00006755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6755 5392 bytes
SHA-256: 66e790886000d99bc0dbed4c170a2b4ae170c84ca590b32d2ae2ec3d227e0c85
font_01_sfnt_off000079d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D4 10640 bytes
SHA-256: d827efdba5cc3ec1e9c895b9ec8701a71e843e94497d652648b3aee42f1e3fca

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