Malicious PDF — malware analysis report

Static analysis result for SHA-256 2538d46cabfbcc41…

MALICIOUS

PDF

47.7 KB Created: 2020-10-26 17:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4977d5cfd202c5b0fbc715ef4cf70b0d SHA-1: 194468fee3d3e89ead4261f46a509c9a91077e81 SHA-256: 2538d46cabfbcc41485e9d066bdea26b748e7e5bb3259c4d49ed05645f355155
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://gettraff.ru/123?keyword=encode+string+base64+android'. It also exhibits characteristics of a link farm, with numerous embedded URLs likely intended to manipulate search engine rankings or distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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://gettraff.ru/123?keyword=encode+string+base64+android
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f926525e0465.pdf
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5f90f0f3575be.pdf
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8ac0c9bc838.pdf
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f8b4704cb7b5.pdf
    • https://cdn-cms.f-static.net/uploads/4393209/normal_5f8ede24b55db.pdf
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/figozu.pdf
    • https://gejuvidafi.weebly.com/uploads/1/3/4/4/134456396/7769084.pdf
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/zufizutizofonubibo.pdf
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/bce3b063.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/rarosazat.pdf
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/71948.pdf
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/a7b88.pdf
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/931685.pdf
    • https://munazuzane.weebly.com/uploads/1/3/4/3/134350045/7844fc1f173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef8dcb84-daf4-49ee-96e7-a79f1aa7e12b/53934381407.pdf
    • https://uploads.strikinglycdn.com/files/9eade8c7-5e78-4f79-88c6-ed40b72f98ed/62205224789.pdf
    • https://uploads.strikinglycdn.com/files/ae518a34-bb21-48bd-8ff2-b21edd899ea4/29419943634.pdf
    • https://uploads.strikinglycdn.com/files/d8c40672-7635-4d14-9fca-a67c69a5ada6/6865637160.pdf
    • https://uploads.strikinglycdn.com/files/9736753c-15a5-423a-ba30-54fa7d349943/vufazonagurubabepi.pdf
    • https://uploads.strikinglycdn.com/files/17497ef6-f705-4c50-9b4f-f14344c14032/78183459625.pdf
    • https://uploads.strikinglycdn.com/files/b16e67dc-d487-4c9c-92d5-42689bed98d1/wideboloxosoxobesirov.pdf
    • https://uploads.strikinglycdn.com/files/76cf6426-db1d-4b03-9c40-e168f657211d/96149441751.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007898.bin
4a52bfe3908ea601522a9b63bdc8be17bbc78670fced80d2959be67adb8201e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7898 5412 bytes
font_01_sfnt_off00008b0c.bin
39be8fa233473c49d369b2a978dc29c6b130b06955762f64376252e78d47a901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0C 11416 bytes

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