Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0863678345cca1…

MALICIOUS

PDF

42.3 KB Created: 2020-11-09 01:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 97b846e5727c8480854d589cb0161b34 SHA-1: 1da7e49b127ffbe25a9d7dfa059b2eeaf8788936 SHA-256: 4d0863678345cca12a2821988167ce5698385919e4b59eb2a9cbf52fb45c9b2a
66 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?keyword=a+knights+quest+for+milk+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449774/normal_5fa8797383a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fa367eb930b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jebokizez/indian_kabaddi_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/how_to_know_if_someone_blocked_you_on_snapchat.pdfIn PDF document text
    • https://zuzoxet.files.wordpress.com/2020/11/dukugafawajasiviwifele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3d734f-205a-4131-b888-7948e7baee86/law_of_sines_word_problems_worksheet_with_answers.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://sigonofov.files.wordpress.com/2020/11/axiomatic_geometry_john_lee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e14d5d-f709-45ec-a51b-90863f7d46d3/81353544865.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/nifamaj.pdfIn PDF document text
    • https://vasukobemuzo.files.wordpress.com/2020/11/68225519059.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/35612033088.pdfIn PDF document text
    • https://tobaluli.files.wordpress.com/2020/11/7635827197.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/29516625830.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/diario_de_vampiros_final.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_off000066aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AA 5284 bytes
SHA-256: 34f22ee046b8172fe8349d1e0748de52244ce8e717c9f387f9e29e9ab890f25a
font_01_sfnt_off00007883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7883 10440 bytes
SHA-256: e06a612345eb19a9db1b50caaccf0aed0672cb4e43069ab67ec0305d5e72d8b7