Malicious PDF — malware analysis report

Static analysis result for SHA-256 81417e93bbd6eefc…

MALICIOUS

PDF

43.2 KB Created: 2020-11-03 21:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a068b32cc624f3c49cde0e39659e9c3e SHA-1: d9badba0e3d95348a838f09269530c81ab1e3edc SHA-256: 81417e93bbd6eefc6bddfa4b93bcce545868a80c5c4a0df6958e8908e3590f82
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=american+symbols+worksheets+pdf In PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/31b843eebd7d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5f8b226713515.pdfIn PDF document text
    • https://vozupixog.weebly.com/uploads/1/3/4/3/134312338/282ace309b149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_5f9a0f5de25e0.pdfIn PDF document text
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/2507860.pdfIn PDF document text
    • https://tokunebejuz.weebly.com/uploads/1/3/4/3/134323577/ridoluma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5f9487992e0db.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/85fafbf3-2240-4385-87f2-d631b2eed2e8/41585587124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e3db09-8fbe-4083-93c5-f2681d0e7320/sizemupirakik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5b5a14-3bb3-4ffe-8e66-670a1977fe8f/29761223025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba524fd9-9b2b-490e-a9ed-3cea1932071a/kusemavul.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_off0000685a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685A 5784 bytes
SHA-256: 875ce7e61924ddb6c35eaa92b203b0fd48b8ea359f891640527b625dcbdf3a0a
font_01_sfnt_off00007bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF2 10804 bytes
SHA-256: e00274203a3d0918a4540c67d019c79220806bff4fe50befeaeabc36cc63873b