Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf589414bd5986c…

MALICIOUS

PDF

42.7 KB Created: 2020-10-26 15:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0e288625858a8736c4a01d29cdd8a448 SHA-1: de3e02312a6bff337b070132e551c4f43839ffd6 SHA-256: 4cf589414bd5986c12a02455dea7f02f26af6ced029d137d315ef573da0e6ec2
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=most+played+games+android+2020 In PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/f765d0f4aa25.pdfIn PDF document text
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/7f5f9ec1d01f.pdfIn PDF document text
    • https://kofejadadamutu.weebly.com/uploads/1/3/4/3/134348877/7327073.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/5748396.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/pejiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5f8f2b4c36277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5f884cd518850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5f8c8f567293c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f89810f224a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f8cbbd36be40.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/92f28.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/7e8ac5219bed.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/menot-mefivok-bosowi-gakigimewip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8fc2d44cbe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f8cc065753f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87321778c9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/5281/7573/files/advanced_custom_fields_documentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533d7775-0480-49f6-ae2c-3c77d8f9d92e/gonewisaraxonew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2aa1405-b72f-4676-879d-e7a652b4477c/duxelojexupuditizerowaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b16cec-7871-47b9-9a08-9335cfabd7fd/86291215094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1ec2fe-6bd5-456d-93e8-00a37315a3a6/1321032205.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_off00006677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6677 5660 bytes
SHA-256: 7d3456e314d98014f84a2323226c6aa979184b311f0a165bacbc98b202806b12
font_01_sfnt_off000079b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B4 10560 bytes
SHA-256: aa277576142d456b58f9501b9da440daf70202b412479f3d4ec5d092ecd54687