Malicious PDF — malware analysis report

Static analysis result for SHA-256 2863733a58ef2c0c…

MALICIOUS

PDF

47.2 KB Created: 2020-10-10 21:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a02ccff4275bbeb49b0d8caa1d946dd SHA-1: 71f6d9b99e1117c2d20bd4daa9f27580663a335c SHA-256: 2863733a58ef2c0c84544f42eb13e1ec69562cadce0aebf81d30f8169f44c785
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files hosted on disposable domains. This suggests a link farm or redirection scheme designed to lead users to malicious content.

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://ttraff.link/pify?keyword=2008+ap+gov+frq+answers In PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/xatabirojivafu.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/xibutane.pdfIn PDF document text
    • https://site-1043337.mozfiles.com/files/1043337/80684997167.pdfIn PDF document text
    • https://site-1038660.mozfiles.com/files/1038660/pegidetuluranujasoge.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/32343059315.pdfIn PDF document text
    • https://site-1040125.mozfiles.com/files/1040125/junadoses.pdfIn PDF document text
    • https://site-1042450.mozfiles.com/files/1042450/pefuke.pdfIn PDF document text
    • https://site-1038495.mozfiles.com/files/1038495/2642749622.pdfIn PDF document text
    • https://site-1041284.mozfiles.com/files/1041284/1825095657.pdfIn PDF document text
    • https://site-1041384.mozfiles.com/files/1041384/68939981692.pdfIn PDF document text
    • https://site-1048485.mozfiles.com/files/1048485/66154512410.pdfIn PDF document text
    • https://site-1037121.mozfiles.com/files/1037121/89095651208.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/f347e781-724c-4300-b2b3-67881df949da/sufunulabivudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6afd0d53-7c8f-47d0-954d-8f42916d0159/35184653544.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_off00007903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7903 5688 bytes
SHA-256: 55e929ca8103c16736445066c6840bda61e4f72ac6ad50b93d50a6a045b8716d
font_01_sfnt_off00008c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7E 10400 bytes
SHA-256: c10c946f85ac33f22b41f90046495c1bda77f2e99399bb597b9bff7eb2a0a438

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