Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c4b56bf2f434d2…

MALICIOUS

PDF

43.6 KB Created: 2020-10-06 13:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3f16cb571d9173bbfae21a1ddcdcdbc6 SHA-1: 76d41d8c90995e94f7c0fe4e8e9728e07a021720 SHA-256: e8c4b56bf2f434d2b95270f5ac401411d151661bbb75c9147b3ea1971d3c85e5
184 Risk Score

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=quantitative+aptitude+tricks+pdf In PDF document text
    • http://titetudiw.fureverfashionbyaprilllc.com/uploads/1/3/0/7/130739173/ribaso.pdfIn PDF document text
    • http://wexil.newbeginningschristianfellowship.net/uploads/1/3/1/1/131164557/3428576.pdfIn PDF document text
    • http://files.episcopalyouthcamp.org/uploads/1/3/0/7/130775221/sanuxufe.pdfIn PDF document text
    • https://site-1040339.mozfiles.com/files/1040339/zefozusupakinomerij.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/lovijepaxaxurifaseruwis.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/zapisibexikajofab.pdfIn PDF document text
    • http://files.skipstonepublishing.com/uploads/1/3/1/8/131871745/b4025f07fb.pdfIn PDF document text
    • http://nojum.eclipsegamingsupply.com/uploads/1/3/1/3/131384169/362bc.pdfIn PDF document text
    • http://sujifu.vanessayoung.net/uploads/1/3/1/6/131636648/243638bd.pdfIn PDF document text
    • http://files.filipemiguelart.com/uploads/1/3/2/7/132741302/94708.pdfIn PDF document text
    • http://juralosiv.warfuelkitchen.com/uploads/1/3/0/8/130813554/6166275.pdfIn PDF document text
    • http://pezaxigi.boonennedroughtmasters.com/uploads/1/3/0/9/130969542/besojulojoja.pdfIn PDF document text
    • http://mesuku.mountviewuca.org/uploads/1/3/1/6/131606349/kituvonavov_nureturonewu_sapiruxago.pdfIn PDF document text
    • http://files.jaidetimmgarcia.com/uploads/1/3/1/0/131070437/wevusonebuduputo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7E 5300 bytes
SHA-256: 6d70e224dfb3590b6d25cef97a57b38bdd8c14bc8a6bf41d4f9d70e97badc79a
font_01_sfnt_off00007e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9F 10356 bytes
SHA-256: 0d6c803de44a86b6d380a3fb6f171112846ce1b0a300e5962c449e9decc367b4