Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65b601edcda6824…

MALICIOUS

PDF

37.7 KB Created: 2020-10-17 06:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fbafceee4a2d1f6d6cb5bb51d9be5575 SHA-1: 819d391a3aa221e94e5e52fafa7b74698432c30f SHA-256: e65b601edcda6824eb66e1b4898bbce22139b7ecc6598f5f45870f0ee5bae51e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a test or document, likely to entice users to click the malicious URL. The ML classifier strongly indicates maliciousness.

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://ttraff.com/123?keyword=english+b2+level+test+pdf+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f875cfa2a89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f8a38b58a7e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f8a5e9a2bf14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f8800e82ed2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f89247c6d8b3.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/tumoboga.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/1b13c5455ff5.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/dbf249c4-0f75-450e-8611-d6157494a557/sasovolinix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4754ae-ccc1-4a54-b454-67223f012216/confluence_stylesheet_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a007ab3-3c83-4158-82f5-676177419f57/57926561755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685c1598-6aa0-41d9-a36b-41473e141c69/43153811719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4855b88f-5e1d-4070-88b0-9f629a1f5c40/74408903181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3265dcfc-f843-4c63-8220-ad612757380c/mabukuronamiluvobobado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cedf132a-df12-418a-b370-25fa3ec08bf2/gazixaxotulipewifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba201ad5-c3c6-4ac1-9a83-5928dfed95ab/95990825634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88eccace-39df-4387-aa9f-66d4edddd21d/58088754700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2517cd-d142-4e16-bcca-6431ffbe9105/kafuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66dd3ac-de94-414d-8142-2ce01a6b8d0e/pajir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a82462a-a322-43e8-af0c-2ef6a01f974b/78408266094.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_off0000535f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535F 5684 bytes
SHA-256: 876771049df7b105e68d18be2972fb000613adef4daeec48d5ad42a7ace6d852
font_01_sfnt_off000066c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C0 10536 bytes
SHA-256: 11e61cddd7bcb2ef95176d0ddcf28dfd9838ae037cf8a46ec6058da4facc2a7e

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