Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe4d4203aed4c1f…

MALICIOUS

PDF

46.3 KB Created: 2020-10-15 01:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ea23034170e4060ec542effc857c77bc SHA-1: 7258fba5c0962a495cdf7a4d0ebd8290ed63cec2 SHA-256: bbe4d4203aed4c1ff754189515d6046c52cca8b76f447d82b0f69d2db68719d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure. One of the primary links, https://cctraff.ru/strik?keyword=surveying+bc+punmia+book+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a phishing or malware distribution attempt.

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 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.
  • 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=surveying+bc+punmia+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f876aec130d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f87429eb7974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f876d803a83a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f87744a0b824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f8759ce7d13e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f876edf7cc59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8729e3872cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5385/1039/files/libros_quimica_inorganica_descargar_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4959/9644/files/jozukawunefed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3439/6830/files/65514254196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/spider_man_2_hack_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/6998/9570/files/9.2_parabolas_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7659/4080/files/xesudumubuxasoxusewoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/jesse_stone_series_tv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/bikuruwuxapezafigezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2227/3688/files/puwakijetedida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/89668477994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/mapa_fisico_de_espa_c3_b1a1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4083/2150/files/56313821037.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_off0000748f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x748F 5736 bytes
SHA-256: 6dbc011aed3c3c069481068d34e01929c120ba74d5017688976eb3a76b96f450
font_01_sfnt_off0000880e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880E 10700 bytes
SHA-256: ac83a8f71fff2ddc740a36588b3d08473a154ee9252121309999399512b1e6ac

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