Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b90acf1bbe2875…

MALICIOUS

PDF

43.9 KB Created: 2020-10-27 08:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fe3cdecaf766d7d0f487d08efbdac436 SHA-1: df7444bf1ceda2874fa194833c3a19509c41a85c SHA-256: c2b90acf1bbe28752a6b29352d503d81918f15e5288d27e414b5d2e6a4eb7124
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=fallout+4+dima+memory+5+skip In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f8a97270fe3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f9339859dfdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f89f7181b1c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5f90a7a39c5bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f90ba5973d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f89c023a22d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5f975440aa91d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retisovojor/thinking_fast_and_slow_review.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/autocratic_management_style.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/72720215365.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/definition_of_curriculum_by_experts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073d4942-2f06-412d-a822-802ef7c14557/prueba_de_kruskal_wallis_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38571af5-17dd-4729-8b24-58b29450626f/napa_valley_visitors_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/managing_technology_entrepreneurship_and_innovation.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/infarctus_du_myocarde_soins_infirmiers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fabf63a-b56f-4331-9b3c-d042c3644b96/mizokumidawapotesexileno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698bda0f-033a-436f-81ce-3e18bb986602/21625554353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51ac112-a3ba-454a-aef7-bfe5e82d28b7/rimafonik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5f9e82-f467-458b-a819-fef464dd4e9f/15701943923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fb920d-98f9-4fb8-9732-8408dd86812e/pazav.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_off000069a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A9 5436 bytes
SHA-256: af56dcb7d8a002bd7691bc5e7165d2a077d9e0aab8d64e0ee002cf145bdff0f4
font_01_sfnt_off00007c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2A 11116 bytes
SHA-256: 71142daf6255d7e3fc427d21a475200dacd7eae20018e834bbf29650645bd6b2

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