Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1123dc5c5a97c4…

MALICIOUS

PDF

67.4 KB Created: 2020-11-09 14:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba98935833f13e778add11e679ae4fcd SHA-1: 74378f8a0a9254bfed9a03af2194baa7a00f8bc4 SHA-256: 4f1123dc5c5a97c4a8ce287e0aee2c8bd0103d64bd47a88bc2e25b1c80386535
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, which is designed to lead users to potentially harmful content. The presence of a 'download' button lure further supports the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious activity.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?keyword=showbox+apk+smart+tv+download In PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/8eb7c1ef3d.pdfIn PDF document text
    • https://tokunebejuz.weebly.com/uploads/1/3/4/3/134323577/852c6f673bbdc.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/971bb.pdfIn PDF document text
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/nadaze-xenaxeram-fifonagizadofir-vakizenidagara.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/naxepebozu-zineziso-renudepute.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/juganomosedamubigu.pdfIn PDF document text
    • https://bawokotofebadu.weebly.com/uploads/1/3/4/5/134507933/doxufimawokoku.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/4236553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e72e4e-d219-48eb-82b0-a64cb7d38ff6/posejuvapoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859eb7b0-82b4-4772-9f9d-713a2616e656/bamex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bcb6b5-2d03-4d35-9639-82c77af981f7/how_to_use_f4se_with_nexus_mod_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0ab589-1a88-42e4-b901-587d1db7e4a8/lirugexupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c097d0-bb46-4803-90a7-233973b0790f/12631861042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f032ae-bb6d-4d02-b9ea-e959910fa61b/84351920461.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_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 5724 bytes
SHA-256: c6bcced8f49878afa244d5d2b9a491c0f9ffe57271ccd2ec150b660c9e41f6ae
font_01_sfnt_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 10976 bytes
SHA-256: 71d7847d493cb0da87ac621dcd84bed90f5e8d11c1259471e567e8fadd4e2ed1

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