Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf37276a63348e6…

MALICIOUS

PDF

44.5 KB Created: 2020-10-10 09:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cb34a68921e7e824cec8a6d66d7e93c7 SHA-1: 6c711dd5947ead5548a434e00f5315259b2e53b3 SHA-256: 8bf37276a63348e6df5545be07d99973b7df61046d79706e0eac1a3f1fa1e7c3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, https://ggtraff.ru/strik?keyword=micrometer+test+worksheet, is identified as a malicious redirector. The document's structure and numerous links suggest it functions as a link farm designed to lure users to malicious infrastructure. No scripts were extracted, but the presence of malicious links indicates a phishing or redirection attempt.

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.
  • 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://ggtraff.ru/strik?keyword=micrometer+test+worksheet In PDF document text
    • https://site-1044066.mozfiles.com/files/1044066/motit.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/xowad.pdfIn PDF document text
    • https://site-1038682.mozfiles.com/files/1038682/suvogawamekegowasetowudo.pdfIn PDF document text
    • https://site-1036911.mozfiles.com/files/1036911/80027939618.pdfIn PDF document text
    • https://site-1039465.mozfiles.com/files/1039465/tavuvoretavaz.pdfIn PDF document text
    • https://site-1037055.mozfiles.com/files/1037055/vapixipaguf.pdfIn PDF document text
    • https://site-1042781.mozfiles.com/files/1042781/70707970777.pdfIn PDF document text
    • http://files.mtlclownfest.com/uploads/1/3/2/6/132695438/gerifapop_nalimetuxopi.pdfIn PDF document text
    • http://files.pamelathibodeaux.com/uploads/1/3/1/4/131409200/0ed67a21df1.pdfIn PDF document text
    • http://nusaxad.michileung.com/uploads/1/3/0/9/130969060/58fba86afc62.pdfIn PDF document text
    • http://files.flipbookpublishing.shop/uploads/1/3/2/6/132682897/zavetuzepu_koruvowakozuba.pdfIn PDF document text
    • http://files.denisegnorris.com/uploads/1/3/2/7/132740525/gawaxisesugonur-delibupizotanas.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/4ae0351d-c43e-4bf8-880e-6e272d95cfc3/41752932562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d8eba1-74ff-4e99-8770-3d64df716a48/zudabakivem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cdeeda-4797-46e7-8569-32d0a6791cf3/78275244247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2eb92d-d9be-490d-b773-d9249bacb088/tuxenijaxudobedes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9271a79-005a-40e5-8e1f-496c2d8d963b/2394248243.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_off00006492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6492 4640 bytes
SHA-256: 8395171d588a7aecd4374bd4dce8773d8544e7ed99d337a2c2bb530cdfde83de
font_01_sfnt_off00007468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7468 10096 bytes
SHA-256: 6af1c2872aa90c7cc1b170c55b98181b2e790c2cec38d4bb16e7b87097bc7496
font_02_sfnt_off000096e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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