Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab3a32da2ac927b…

MALICIOUS

PDF

41.9 KB Created: 2020-10-04 18:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 739f6cc22c3db2301bcd464a7f2fd411 SHA-1: 2c2cc2ec4ee410ba536961a5828cafb22b0fb53f SHA-256: cab3a32da2ac927b78bbe10d50e5045ec84e0cbbe13681168db93dd2a4da3b65
124 Risk Score

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=texes+235+practice+test In PDF document text
    • http://files.etefl.co.uk/uploads/1/3/1/0/131070602/ddf68724f348e4b.pdfIn PDF document text
    • http://files.efungpstours.com/uploads/1/3/2/7/132740270/8455354.pdfIn PDF document text
    • http://files.brightstarlifestyle.co.za/uploads/1/3/1/6/131607662/wexesaw.pdfIn PDF document text
    • https://site-1037875.mozfiles.com/files/1037875/fokumogolupoduw.pdfIn PDF document text
    • https://site-1044453.mozfiles.com/files/1044453/jupesewujawawiwaforitariw.pdfIn PDF document text
    • https://site-1041486.mozfiles.com/files/1041486/31952608625.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/41526864643.pdfIn PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/12373307958.pdfIn PDF document text
    • https://site-1037883.mozfiles.com/files/1037883/wakotezala.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/a1e4cb44-832c-4ee4-82c2-f3048560a9ed/saroz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9831bdcd-3832-4414-99ea-4bd1068719f1/22746758667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb52b3e-7352-4984-a034-6aa3654bda49/7197777576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdab8bd-d2c9-4b4a-8720-adf5af58b915/72057183452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f0ab69-0f17-4544-a88c-26460416c5d9/3307087669.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_off00006240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6240 5332 bytes
SHA-256: 027d5540679dc24ec79a5bcbd57b0c04b9bd4f1c1cd8b9a002f9bf9b2157392e
font_01_sfnt_off00007478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7478 10904 bytes
SHA-256: b81e040e1132eec057c3b8e8db240a530e319dd1c4e4c87d1472de623154daf0

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