Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a67b7628e344f5e…

MALICIOUS

PDF

40.3 KB Created: 2020-11-07 20:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1c3d25ed81b116ac8f6e0b5c622a43a0 SHA-1: 29c0e867a549e311111a32db0a6b7ada913c208a SHA-256: 4a67b7628e344f5e0d423c77884f2eefb92065ff0cbccf8dad5812117db21e88
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to 'trafffe.ru', suggesting a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. Although no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=scanners+police+online PDF link annotation
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/6425868.pdfIn PDF document text
    • https://luvuzinek.weebly.com/uploads/1/3/4/5/134502649/zevolikiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/49246087454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926c8a84-d328-45b8-b854-6b3654aac3f9/93200087012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef29803-256b-4c76-bd5c-4dd9421d0253/nigerugagom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fbbc4e-c90f-4b87-bee7-5010fc1c1554/57399101131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488b0c9b-9a1a-437a-9470-b0ea570ea5fe/60145583129.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/anatomy_drawing_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca14f0b2-35cc-4c5f-a122-dca00083878e/vorazalasomibufuzuvabusaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2d618b-89ee-4e93-8024-918f7633ffa9/sapiwidimitiwidixiladex.pdfIn PDF document text
    • https://marobogogo.files.wordpress.com/2020/11/adobe_acrobat_pro_serial_number_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8bbaac1-85d4-45c1-81e9-a8beced40d0b/fivugufolot.pdfIn PDF document text
    • https://gexuzovi.files.wordpress.com/2020/11/reflexive_verbs_practice_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78621ca-da7c-4bd0-9237-365f646a63a0/2007_toyota_camry_hybrid_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ade8d0f-5bcd-4956-95e8-256220ad4238/nulutaleve.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_off0000618d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618D 5032 bytes
SHA-256: a99ab53694baf6a6490160b220f55898c6fb0d2f01d9aff1a9dfc026d9962a15
font_01_sfnt_off000072ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72BA 10280 bytes
SHA-256: 07b5a2635246e2d264c97544a5982ef8b30203bbe2acab7aede42882ccdd6c18

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