Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd86eb8791c1dc88…

MALICIOUS

PDF

51.2 KB Created: 2020-11-07 19:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 909ed70fd23dfec7a02db7f5f88d9ae1 SHA-1: 5a7e2b83d599431426fc1e8c7176c96c71cb4a07 SHA-256: cd86eb8791c1dc8880fff6157d5c67dbe3db6f57667b24b1c54b14f2a2fede1e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. Another critical heuristic identified it as a PDF link farm, suggesting a coordinated effort to distribute malicious content. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful sites.

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://traffking.ru/123?keyword=short+poems+about+nature+for+kids In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f8ff8ab523a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_5fa2ec4ddba08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5fa4ef98b3f4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/58514ca1-bf0f-4348-a87f-2fe8281e6088/doodle_jump_unblocked_games_66.pdfIn PDF document text
    • https://mafovilavo.files.wordpress.com/2020/11/receipt_of_payment_form_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a992bd7-93be-4c57-8a96-2a3e2b0fa18c/magupevivojusivixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d4a380-0738-4ad6-a584-109191fa7856/balisujar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e7bf5d-6cf7-4b2d-829e-bbd4cba602ec/rozuso.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/wanojuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f18529b-41bf-4944-9881-dcd4c66f9a69/86454453671.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC1 5436 bytes
SHA-256: 10fdcb28dc96ed1051d80d42ce77aafb1629149f5fd0a67c13bae4b6ad85dd2c
font_01_sfnt_off00008d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D07 10924 bytes
SHA-256: d58a1e63465e7e6af8d987f4e23cb3cc8f7be61eb7bd07c7d9baf9c0a121e0fe
font_02_sfnt_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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