Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b1fa8ab4481d77…

MALICIOUS

PDF

181.1 KB Created: 2020-11-05 11:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 79a7d027ed3a0463d3473f7a05b7127b SHA-1: 3c293065d4184a6015cb2d52d4e78c39b7360fb8 SHA-256: 23b1fa8ab4481d77a96ac1e347c2e3143c26f6560f04e980f90a8193c14bfe01
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=list+of+anime+art+styles In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5f95f536978bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5f8e276b694c2.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/9be49eb89d1b10.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/lujoliwupu.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/xivebixadakutosuxot.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/c8d430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f8bac81baf8f.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/6441432.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/danitori-sigegomazenala.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/1/0481/3923/9585/files/growtopia_hack_tool_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/how_do_newton_s_laws_of_motion_affect_flight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7804/5862/files/28172757195.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/questoes_do_enem_sobre_analise_combinatoria.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26918 9084 bytes
SHA-256: f14e23825150e9ddbb5839b63fbdb9beed36b87ce0c327d465112e68ff1fb8ee
font_01_sfnt_off0002876b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2876B 4956 bytes
SHA-256: 3839704b2b869dcb0cf75f01721ce85e16ee814e231a0fb750b6e19534a9f364
font_02_sfnt_off0002983c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2983C 14448 bytes
SHA-256: a1518297bbafbbb238aceaefaa2ee729d473013fb4c7e81e7d1d3b5316a544d6

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