Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efe9e29fa00db79…

MALICIOUS

PDF

64.7 KB Created: 2020-10-01 06:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a7e35dc59d352f34ff9e04e4ac1d58d SHA-1: 72cad25179d80ef1f58113ea67c1442d8baf978e SHA-256: 5efe9e29fa00db7921fa512aaaf056c3f1cf14c7de88ed99c63067c6751e3371
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed for SEO manipulation or phishing. The primary link identified, 'https://cctraff.ru/strik?keyword=dfl+spielplan+2.+bundesliga+18%252F+19+pdf', suggests a lure related to sports schedules to entice clicks. The ML classifier strongly indicates malicious intent, and the sheer volume of outbound links points towards a distribution or redirection mechanism.

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=dfl+spielplan+2.+bundesliga+18%252F+19+pdf In PDF document text
    • http://files.worldyouthpeaceforum.com/uploads/1/3/0/7/130739275/ripotunegoxoro.pdfIn PDF document text
    • http://wubazifaj.abcformepreschool.com/uploads/1/3/2/6/132683286/c712cb413a64.pdfIn PDF document text
    • http://files.pilgrimsailing.com.au/uploads/1/3/1/8/131856627/9667260.pdfIn PDF document text
    • http://luvev.nancyhaverington.com/uploads/1/3/0/9/130969354/7713926.pdfIn PDF document text
    • http://files.k9movementimprovement.com/uploads/1/3/0/7/130776132/vawate.pdfIn PDF document text
    • http://wamas.tacvet.com/uploads/1/3/1/4/131406082/porex-merusar-dajizosexeduno-nariragenegel.pdfIn PDF document text
    • http://files.tavellielementary.org/uploads/1/3/1/0/131070561/2456465.pdfIn PDF document text
    • https://site-1036760.mozfiles.com/files/1036760/wisilipejafogidomu.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/32367146408.pdfIn PDF document text
    • https://site-1040144.mozfiles.com/files/1040144/88592762570.pdfIn PDF document text
    • https://site-1038391.mozfiles.com/files/1038391/dizeta.pdfIn PDF document text
    • http://files.cherokeecheetahpta.com/uploads/1/3/1/3/131379894/1783266.pdfIn PDF document text
    • http://besajunef.harmonyhallonriverside.com/uploads/1/3/1/4/131454521/6755364.pdfIn PDF document text
    • http://files.kiwanismusicfestivalsj.ca/uploads/1/3/1/8/131871568/vitewufapedelo_luwavibi_sufajigo_sekinelukagu.pdfIn PDF document text
    • http://mamamizo.accionpoliticapcunista.org/uploads/1/3/1/4/131407082/dubek.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_off0000b0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F9 5856 bytes
SHA-256: e20a19189ac6a9dd971f7bfc235f09ee3fb053568714491332d12dd57a3dfed2
font_01_sfnt_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 15288 bytes
SHA-256: a8de73efe4356497c7ff89972a18a16a61f94b0579e2d374375475dd389fb77a

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