Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e42949e423d2fb…

MALICIOUS

PDF

84.5 KB Created: 2020-10-25 23:13:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dc44057f139bad8fd3f6f869300aa3cd SHA-1: 0f8fe1526560f6b97641fb3844377d728dae1cae SHA-256: c4e42949e423d2fb514291577770df0c227dfd076aca9786b5e8abbadf17e6c6
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as educational content. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to drive traffic to a malicious URL. No scripts were extracted, but the presence of a malicious redirector is a strong indicator of a phishing or scam attempt.

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.link/123?keyword=linear+equation+in+one+variable+questions+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f87620e64464.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/wejidafisa.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/5780235.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/nevevijasazemi_fififejevowofi_negimi_fusumim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f8edb2a317c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f8d1d9d2bbce.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/64eabcdd-f254-475e-9590-d06acb213175/remavuzokavusexan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465d510e-c663-4777-a3f1-228b4bf2e5e6/farajazosunoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92f407c-3bac-4454-83ee-48e0d46a0815/bipivivatez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517dc887-6ee8-4bee-b0a8-36d69c90f641/74055299471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19360195-b2a0-46e6-a17b-1d3480adf41e/mabipegaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/zunodinozag.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/84204285734.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/18808283850.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/8104599633.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/55264325576.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/anti_apostle_1025.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/49541177099.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/acido_borico_usos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 5184 bytes
SHA-256: e91036a43dfef6b0f681cca298943d2af50546fde3a85cfb5dffd8b5955f72ae
font_01_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 12088 bytes
SHA-256: 58559d9b923acf94077c593f71600e86e9a1ebd06a7831a41a19b7864b5813bb
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 16152 bytes
SHA-256: ac862b3b210000b3768449942676625bf142175948d44b65994e1b7ccaab9570
font_03_sfnt_off000134dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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