Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc79a8f1a243852…

MALICIOUS

PDF

51.8 KB Created: 2020-10-14 18:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9edf8ccc0ec3f34006a0d92936324e3a SHA-1: 87c99a374d8c4cd1f661b8655c0989b7f948c944 SHA-256: cbc79a8f1a2438525af0890813892d9c6aef00e8ec109acfb712fd218fbb3130
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/strik?keyword=michael+herr+dispatches+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f870b556b9c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f870f4569982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f86f59b30c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f86f52b5482e.pdfIn PDF document text
    • https://site-1038999.mozfiles.com/files/1038999/fesulowigigowabitura.pdfIn PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/numaduxoloxud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d760d4e0-a2fd-4686-8084-ecef044b21ca/61650256189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9005b31b-fabf-4ad2-b9dc-e0ff9b493e42/lejaliro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0634cc8-5ff0-4916-b200-aa36bf6764db/dosexomujurukililenem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562e15b7-fdde-43c9-9f03-bcfe337aa305/31373706207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44fa9acb-85fc-4f68-92d9-102acb6f2eec/notatidasifujuxage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1e825a-9b5a-4893-8553-9d2d647e4685/59133131213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b481aa1f-3c14-4ff7-bc10-fd2e250b10b1/giral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a766f450-9494-4ad2-90e4-bff62a38bfd2/xivamik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88cc23c-daed-4c17-aa8f-808ba2dca9d8/27835611614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096f4f58-2665-46a7-81fa-79339e20cd7c/segasabibafelosebuzej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d62a0fb-9f66-4444-8a5d-0f59a2d1649d/4284111818.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A4 4820 bytes
SHA-256: 1756ff4b896a645d28e9f438b6ff8c34a1bbc27ef4058aeb1a646f53494e2058
font_01_sfnt_off00009113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9113 10112 bytes
SHA-256: 9cb94589e567aa5bc6a05b7614fbd66032db9ba0c1e9d8a721dcecdcc3feb71c
font_02_sfnt_off0000b3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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