Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae8cf6f851b8f3f…

MALICIOUS

PDF

37.3 KB Created: 2020-10-01 19:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d989ba3a52a3ac6d43295db6a6308d19 SHA-1: 0c6f9a97777d3397bca2a0d53c5234a4f4521475 SHA-256: 8ae8cf6f851b8f3f2243ffb49a9ddd7f6235f3d463fe1cc4723c72eda2191c17
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the one flagged by the heuristic. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to click on a malicious link, likely for further exploitation or credential harvesting.

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://ggtraff.ru/strik?keyword=anthropology+optional+paper+2017+pdf In PDF document text
    • http://files.thedustinnulfteam.com/uploads/1/3/2/6/132682913/rifufujalafisubonox.pdfIn PDF document text
    • http://files.valuablebatteries.co.uk/uploads/1/3/0/9/130969386/d004e.pdfIn PDF document text
    • https://site-1036661.mozfiles.com/files/1036661/67320595094.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/vofug.pdfIn PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/kedumowe.pdfIn PDF document text
    • https://site-1036965.mozfiles.com/files/1036965/falogasatopofazupifosal.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/famafukeredunelirireruren.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/5102d0c8-c4d1-4efd-9353-2f9336d4d98a/13224868232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8373660d-1c73-4bdd-a132-4b12b26c2bbb/pejukasujiligivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6d80ed-62f2-4e16-917a-41f89f0de2a3/digeferus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59d940f-fa6c-4325-a1a5-9aa0bc23fc66/wajasegorawodabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b895fd-2918-44eb-b514-3466cd3997f6/10880655236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb1d24a-8c5d-4f05-bd74-24877e2d4399/ronupasokewupi.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_off00005267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5267 5620 bytes
SHA-256: 87d1fb73ebb8f8ecdafa47264a1eba46fd8558f4065e8a3122fbd6549d212507
font_01_sfnt_off000065a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A1 10304 bytes
SHA-256: c8f37657e7488d5016a0545e2650822a53d16ffd950bed42a3e65de18722e7a2

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