Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f8d41be4be74a7…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 15:57:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c18b2bf6725e7bde112b12a7c3b80ec0 SHA-1: 569f2061f75a8b0a5ce0d51eb35375724dd6b876 SHA-256: f5f8d41be4be74a75249ee3b774485ec24150495cbbdae597560f99cb983ba8e
182 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are SEO-optimized lures for game hacks and generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of URLs like 'http://netcdn.tw/app/479516143/how-to-make-a-minecraft-bedrock-server-for-free-game-hack' strongly suggest a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.tw/app/479516143/how-to-make-a-minecraft-bedrock-server-for-free-game-hack PDF link annotation
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/cheating-in-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-hack-roblox-accounts-with-cmd_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/como-tener-robux-gratis-en-roblox-si-hacks_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/descargar-roblox-hack-robux-pc_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-change-your-roblox-name-free_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-cheat-is-guess-the-song-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/alt-delete-item-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-cam-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/robuxian-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-hack-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-roblox-scratch_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/how-to-noclip-in-roblox-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/In macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D1 21648 bytes
SHA-256: d03a99d5c38b866dde9d8c83999c329e7b4c56fb4b3644901587142a436b1c2f
font_01_sfnt_off00006056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 18836 bytes
SHA-256: 7d3c11488f6da4305f73d6680d299b897c090da3807d73220efe7f5f58af714b

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