Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f51637ea6b3a669…

MALICIOUS

PDF

50.6 KB Created: 2020-10-14 22:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d29e9d150deadf8f724d02f24a8140d6 SHA-1: 6c702160dca3d4f5edf42c6b5cbc8af9d605d18a SHA-256: 7f51637ea6b3a669d81c972c158c76bb026bcd59512ad795e163e57b175b704b
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/123?keyword=alphabet+letter+activities+worksheets In PDF document text
    • https://site-1039624.mozfiles.com/files/1039624/73543196970.pdfIn PDF document text
    • https://site-1043170.mozfiles.com/files/1043170/polesoxigedonitomenikuwa.pdfIn PDF document text
    • https://site-1038772.mozfiles.com/files/1038772/90713848186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f875293f335a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f872ddac2c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f872ce02b202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f872a6a6c6f1.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/xujewonagamaxu.pdfIn PDF document text
    • https://site-1039811.mozfiles.com/files/1039811/gobimokugazaxubipide.pdfIn PDF document text
    • https://site-1041483.mozfiles.com/files/1041483/28517445539.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/39342157-e273-478f-9a3b-3f6b6767a22c/68206668837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22347802-814f-41e0-b2b0-f92b4baae037/wodaxexukaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c2e36a-d457-49f5-a738-27e427023e43/noxarosadinupilo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6917 5364 bytes
SHA-256: 9d80a346201ab6cfe9e65d0645853b3e4ecfb7be701e6960f79529b31cae17aa
font_01_sfnt_off00007b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5A 12984 bytes
SHA-256: e32255d28e9058aef22d9b694328881e7b5b845d0382d7e1e15e46c2151806b6
font_02_sfnt_off0000a51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA51E 16836 bytes
SHA-256: 282e012acb0849d4242a9be23e504b28dacbd16d22511dbd4c04fd65e8a9b01c

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