Malicious PDF — malware analysis report

Static analysis result for SHA-256 838d3ca7a65be0f8…

MALICIOUS

PDF

42.6 KB Created: 2020-10-30 00:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d0c6cbb8e8b704dccdbb877ef80554af SHA-1: 33119f1ebd3824af57663001d8b3bd13cac157ca SHA-256: 838d3ca7a65be0f86f81fa273a972e804a35307ad2ae256c960a4eff02379df2
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains text related to 'Fannin county tax assessor collector' and the malicious URL, suggesting a phishing lure. No scripts were extracted, but the presence of a malicious redirector link is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.club/123?keyword=fannin+county+tax+assessor+collector In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f9b3e2fea428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f9a41945fddb.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/susopuzupure/acta_de_nacimiento_tamaulipas.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/definition_of_love_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368403c1-591f-4e0f-9148-b8dd90c1b77f/venugaloribomevisasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3d8dd4-31b2-4b3d-944e-5636a467f66e/98032070720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490af568-3719-4b48-a0f1-d68be22e2bdc/kafupuvikimukoletok.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/nemixejuzekavifebilad.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/parametric_and_nonparametric_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedbbe95-c2d9-4d27-9662-9ec5d3f4924b/49717603782.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/43915420861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865505e1-9737-47a2-b8d2-0de9aaa83db9/baranojused.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_off0000662a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x662A 4916 bytes
SHA-256: eecd2183a083de1aaba78a13ec13a1b119c5c047fc2ecff0c7016faadd72158c
font_01_sfnt_off00007703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7703 11420 bytes
SHA-256: 7f7644791dd644f79733f60ab4a565811b9d79476c28aaaeb046bcf5a1be4afe