Malicious PDF — malware analysis report

Static analysis result for SHA-256 833f7478eef8f25f…

MALICIOUS

PDF

33.1 KB Created: 2020-11-05 00:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c40815d63756d512f509cbcf92da8822 SHA-1: 14b94b2e705a25d2c1fa17b82739a670f02edf23 SHA-256: 833f7478eef8f25fb5f2e0409ffc62da5d345d3499317e23251e8cb70426540a
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL `https://ttraff.cc/123?keyword=lyrics+brave+strangers` is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and the malicious URL suggest an attempt to lure the user to a harmful site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/123?keyword=lyrics+brave+strangers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_5fa02536006ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f8898077d0b7.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/dexanavitusami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5fa32f61384a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fa18c36b017b.pdfIn PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/6753521.pdfIn PDF document text
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/jiwumakorotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f8bbb88ebfdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5f978bd22c7fb.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/464d22e7-bfc1-4a32-87bf-354179d25bf7/fe_practice_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/volkswagen_ethics_scandal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6634c441-08b0-4e93-b33d-777bc637c2a4/xikuninegaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd545ab-60f6-4d1c-ba87-338a4b778ce9/60857495559.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_off00004554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4554 5180 bytes
SHA-256: 5e4794537b51950d1827177d29036b332ba7a7923b81fee0fdd5b47103699804
font_01_sfnt_off00005716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5716 9792 bytes
SHA-256: 73eebd28ab085202f002f58c8223095032ef4e36a972bd22037a0c2a607623af