Malicious PDF — malware analysis report

Static analysis result for SHA-256 96668cc71771dcfc…

MALICIOUS

PDF

43.7 KB Created: 2020-10-14 22:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e2d06934cdc4ba7ee443b75649dd6e67 SHA-1: f9a058e3616082ef9118f14ec8e89829d9a3d76c SHA-256: 96668cc71771dcfcd7c22556dfed4e65650a5372546f7e66592596c1dc0ac35e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a lure to external malicious content.

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 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.
  • 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://gettraff.ru/pify?keyword=hsc+computer+science+textbook+pdf In PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/6497588.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/3257372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f870ee04e9ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8701351021d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8746e885b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f86f4615f374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f87490bd6853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f86f8fa18461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f874542466ac.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/1a61de55-6658-4a82-a2d0-68120b11170e/29734708502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51cec53-7a83-43e1-9091-da334be2847b/dukuxokuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2068794-e16b-43b0-8a12-b0500d9048a9/23599941396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25ef35b-a5f4-4821-b98c-ec7d0da22289/resakopinale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8855/9782/files/frigidaire_gallery_ac_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8007/0821/files/dodge_dakota_manual_transmission_identification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace158c3-0201-4951-bdcb-26566e335217/wavalexemom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4677c6de-ecc9-4c51-be1c-f7d062686f4c/lazab.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_off000063fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 5292 bytes
SHA-256: e1a3033c40089eb1b012dfb44b9602b8026006e59849fa591b95fbaf8326295b
font_01_sfnt_off000075dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DC 14012 bytes
SHA-256: 659c68a65555fd54373b51af60ecf670ff2877ef59091f2dfaa79fe932ab4ec6

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