Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e81bcb2025de9a4…

MALICIOUS

PDF

46.5 KB Created: 2020-10-08 08:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d532004966d231d0566975c98740d3b9 SHA-1: e12fb4351a4fe8940756353148e1b3355503701a SHA-256: 8e81bcb2025de9a4a615088754d47623a057f1d41e991c6205caead54aba8071
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://cctraff.ru/strik?keyword=no+man%2527+s+sky+upgrade+modules', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'No Man's Sky' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=no+man%2527+s+sky+upgrade+modules In PDF document text
    • http://files.themiserablenewyorker.com/uploads/1/3/1/1/131164386/kigumuxati_jafutefawuwimo.pdfIn PDF document text
    • http://tagufoza.nancyhendersonwriter.com/uploads/1/3/1/3/131379769/fd24c204e5f4fc.pdfIn PDF document text
    • http://files.prostatecurefoundation.com/uploads/1/3/2/6/132695707/pezuvuvefovasuziki.pdfIn PDF document text
    • http://rovumaf.counselingcreativelypllc.com/uploads/1/3/0/7/130775195/loromo.pdfIn PDF document text
    • http://files.kellyseyelashextensions.com/uploads/1/3/1/6/131606392/wosaraka.pdfIn PDF document text
    • http://files.mpgresponsibilitynow.com/uploads/1/3/0/7/130775475/fusukub.pdfIn PDF document text
    • http://miwunu.homecompanyservice.com/uploads/1/3/1/4/131406665/39751c.pdfIn PDF document text
    • http://navew.taiwanhotelnews.com/uploads/1/3/0/8/130813714/pumenixuwifo.pdfIn PDF document text
    • http://files.hightides2.com/uploads/1/3/0/7/130775127/5346782.pdfIn PDF document text
    • https://site-1041503.mozfiles.com/files/1041503/14873878169.pdfIn PDF document text
    • https://site-1038303.mozfiles.com/files/1038303/xodivefuvizogusi.pdfIn PDF document text
    • https://site-1036818.mozfiles.com/files/1036818/nosawezox.pdfIn PDF document text
    • https://site-1036764.mozfiles.com/files/1036764/46305201839.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/41373f5f-4437-4902-bc0c-a43056617aab/35731617537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddfa129-de87-4abf-bfc0-597bc6c42759/rixumizelakariporevupova.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_off00006daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAF 5448 bytes
SHA-256: 2abaf272e01e70bd8c071a951b7c9518cb6f2a8daa2605722aeec0d6c385522e
font_01_sfnt_off00008037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8037 14544 bytes
SHA-256: ccc87184f4e98d756b9e7b62f88f625fcea2ec585d993b832a8d7ba709136a30

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