Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c141441ccebcc6…

MALICIOUS

PDF

37.2 KB Created: 2020-10-28 02:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e37a209c343bfb68170a5b3349e590a9 SHA-1: 4a977094ad53344e0a0c77e882b1ab2beb07934c SHA-256: 05c141441ccebcc6893bcbc49a385f5b92c194450770e532185041e95b778961
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing malicious software disguised as a necessary update or plugin. The primary malicious URL identified is cctraff.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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=mass+and+weight+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5f8ed677018a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_5f98b0f0f25b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404133/normal_5f973bffe4c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f97a4dc456f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5f948191482f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f9156518eeb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f8788eca25c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f8d56fce2b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8702bb99816.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/nazepapoleser-kebugefe-temuxaporazoj.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/5019697.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/powuwenalapufaxusun.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/0ee5489b.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/a1edd5e4-01e3-42df-9ebc-bb1e732cb23e/zotupinatiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46178b56-e643-4dee-a071-590c054ce0c7/biology_semester_2_study_guide_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7344b2-4da0-4a41-947e-c50215c0aa9d/17594606963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9074/8595/files/tero_da_misericrdia_meditado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9686/5445/files/react_native_input_validation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0801/6551/files/vinayaka_chavithi_book_telugu_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3272/2599/files/screen_video_recorder_app_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/historia_de_lunas_alejo_carpentier.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/xojosanelonupolisobugeri.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/gedipafujugebimudaronu.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/network_architecture_definition.pdfIn 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_off00005c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C21 5216 bytes
SHA-256: 815d9797e065247844a44d9b629c64b85d3f24e1c8a7044475bdb180f50f1c57
font_01_sfnt_off00006de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE7 10368 bytes
SHA-256: 191c9f6fc6aabeb336c4bf16a52053e81e0d144e713cbc71a1e53634a54175c2

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