Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9288172826da16…

MALICIOUS

PDF

43.5 KB Created: 2021-06-11 09:15:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a79606bacb4e3f9c0d3668cd1bf233ea SHA-1: 82fbc7df23c5975c86d34856b6e10690368540ec SHA-256: 4c9288172826da16309ae17a7150e10ef526674b5f7400c06ab34223a637d604
122 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, directing users to a URL that likely serves as a gateway to download further malicious content. The presence of multiple game-hack-related lures and the ML classifier's high confidence indicate a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a common pattern for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/free-account-in-roblox-biz-game-hack PDF link annotation
    • http://slims.abulyatama.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/wurst-18_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/youtube-free-fire-tik-tok_GM835599320.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E96 24656 bytes
SHA-256: 0c49ac5434676183305293e00de85127b6c9d780f6f6c42220bfbf40e6736f0c
font_01_sfnt_off00008736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8736 18392 bytes
SHA-256: d0c428254c78cd60e4c8954c352a903aba91cdab99d128661309bd83ca2ab079

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