Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cacba7226de0870…

MALICIOUS

PDF

51.7 KB Created: 2020-10-04 19:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2827ee3ba75e3d36745766a0ce076189 SHA-1: 7405b721b4fb9994655cc83735858e8c3e69606c SHA-256: 2cacba7226de087053738c17eec074ba33897e8d96ad98428becaf0d6081c950
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/strik?keyword=ejercicios+de+oraciones+subordinadas', suggesting a lure to a malicious site. The presence of multiple embedded links and the ML classifier's high confidence indicate malicious intent, likely related to a link farm or phishing campaign.

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://cctraff.ru/strik?keyword=ejercicios+de+oraciones+subordinadas In PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/60617879962.pdfIn PDF document text
    • https://site-1037172.mozfiles.com/files/1037172/81520231496.pdfIn PDF document text
    • http://zuseru.heartoftucsonart.org/uploads/1/3/0/7/130739344/e781fddac9.pdfIn PDF document text
    • http://files.jancancan.com/uploads/1/3/1/4/131406413/sosazidisajawaj-ledosol-vaxodavuv-ziwobedomanefon.pdfIn PDF document text
    • http://podido.drhafezi.net/uploads/1/3/0/8/130874474/58e51b5.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/796f1e9e-a536-476b-86b3-91617cc60a0f/warugexol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5091919-1d3b-46f8-a021-7cf1bfc2fd6e/koradobexot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56f0e52-8a33-4b50-9fcb-e7ad54c7b668/49541943164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f9dcfa-b81c-49fa-b0e9-8a59e594ba76/16611355379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a593e74e-75e9-42ed-a1df-f6e2ebe87a5b/tobolelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a8e7f9-804d-46e4-9862-9c7184c6572d/19997977104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7afa19a7-a09d-4838-95c9-c0fecffbac02/zurusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f3c989-73bb-406c-b1e1-472b5e173c25/kibejixita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdde268-7ff2-4b45-89b6-cebc89b37c22/13304062944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc56628-b7a7-4cd2-b40e-1061110623ee/kibevometukogudaselej.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_off00008ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE2 5072 bytes
SHA-256: c51ea686045b503c8f73024a72d12a6b93973f86202472cb467e2d7c0b16dd15
font_01_sfnt_off00009c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C2D 11224 bytes
SHA-256: fd5628f4d0ae632059e333a35b283ca324ff96b19de8043106b3a787aea999eb

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