Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95c55ee62510a5a…

MALICIOUS

PDF

40.3 KB Created: 2020-10-08 21:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ec2a1cb1fe15713d2350f158fd29be81 SHA-1: f14c578869e1713a5abc3403b06ef5f40a9b08c1 SHA-256: c95c55ee62510a5af4f003d351e59782dfc31b789632e35ccba7e8075a77c1de
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the primary purpose is to lure the user to a harmful site.

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=emtech+zm-+2 In PDF document text
    • http://files.chirho.consulting/uploads/1/3/1/1/131164157/7232353.pdfIn PDF document text
    • http://files.kenleighsfiberstudio.com/uploads/1/3/1/4/131409090/6264961.pdfIn PDF document text
    • http://kawilaluw.lovesparkfire.org/uploads/1/3/0/7/130775162/ruwuwepuwubuvuvixix.pdfIn PDF document text
    • http://files.8-bit-symphony.com/uploads/1/3/2/7/132740982/e2c5aee.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/15293169706.pdfIn PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/nevenefuzomipokaluxed.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/35978434040.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/64116737311.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/cb88abce-8d80-4407-a5fc-f573cb1fbbbb/37412829591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109fee61-97d4-47b9-b0c2-75f68ebb239c/64054090488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93f6fde-e35c-434e-9651-b9c34a00a72a/76117125893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3903afc1-51a2-4e0b-9235-f086462141a8/ritizegipusujiberipa.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_off0000616a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 4696 bytes
SHA-256: 9142e5b4c4625f5282c81609fac2698d87f625d5e076ca18c152833fd4531ebb
font_01_sfnt_off00007152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7152 10440 bytes
SHA-256: 497bcd493d86533094bed16c686be67d140b98bed1c50270fca724d56171d498

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