Malicious PDF — malware analysis report

Static analysis result for SHA-256 a727b959f30efb9a…

MALICIOUS

PDF

37.1 KB Created: 2020-11-04 02:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f54067c24683e3301afc39bd21cc099a SHA-1: b99b6a1303042d1012e0d642710594af901d99f8 SHA-256: a727b959f30efb9a15b4c8f73904ad7fbfe0deb7fd71a6e4ce41fe44cb12454c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large collection of external links, suggesting an attempt to drive traffic to various sites. The ML classifier strongly supports the malicious nature of this PDF.

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://cctraff.ru/strik?keyword=titans+schedule+tv In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5f8bfb12abfc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f9cb75e8b05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f9a3eee8d3e7.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/a923f2aad234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f9aee332bd21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5f8ab673d9376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f909b949cb9d.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/46178b56-e643-4dee-a071-590c054ce0c7/biology_semester_2_study_guide_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b109169-d606-4884-a732-1ae531e80660/veeam_quick_migration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9894c4d2-3168-4dbc-b2cd-3cec687203c4/paul_stainthorpe_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/adobe_reader_download_for_pc_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18aba5a4-8ff0-4fa7-9a8c-ed3a24eeae9f/wazixise.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/vampire_knight_yuki_brother.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_off000053d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53D3 4940 bytes
SHA-256: 42f72729940fc74411cc1ad473bc794b728bbafae56ec61185526efc6b7f5749
font_01_sfnt_off0000649c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649C 10392 bytes
SHA-256: 7ceb4022a39da2b5990be37ad509005992902cd4603f41c640277e122e945610

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