Malicious PDF — malware analysis report

Static analysis result for SHA-256 412256b75dc2106b…

MALICIOUS

PDF

41.4 KB Created: 2020-11-05 18:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 94576ce3ef7cbb097134b31b7513dee5 SHA-1: 193dc8d7a7b2c88c56574074fe69b7ebbfe09fd5 SHA-256: 412256b75dc2106b1eb44c7f87437c030cd62d5b69b92fab41399eb7477a4bee
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The primary purpose appears to be SEO manipulation and directing users to potentially malicious content, as indicated by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/123?keyword=the+coming+of+beowulf+summary In PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/tibasakavale.pdfIn PDF document text
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/6964943.pdfIn PDF document text
    • https://vukibawurop.weebly.com/uploads/1/3/4/6/134601902/fotasiba.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/sozusor-gofizulukan-pisobal.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/kuninejebeto.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/toduxotupamup-bazedadoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5fa168b88da84.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/be514ae1a141e65.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/wupesixupa.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/f80833dce4a0f85.pdfIn PDF document text
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/8452784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_5f9b0f68b2e7f.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/miwolezedubujoz/cetoconazol_cp_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b117afb1-b349-4b36-8631-8f66c60c4afd/12887468660.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_off000063d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D5 5580 bytes
SHA-256: 399c725364fea51f2357f4c97b7a08faf0e5ae622cba275a81c7a41fdc4ee056
font_01_sfnt_off000076c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76C3 10168 bytes
SHA-256: 0da43030f78f086e9ca01eb93bda03983622340a7154d94391ddad67c658f5b5

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