Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9221b8b78f1fc9f…

MALICIOUS

PDF

33.5 KB Created: 2021-07-03 18:42:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 43069d07ee44485c352e16482b00d9c8 SHA-1: 8576bca37f8b9114beb37f25a8aa5bf29f083b70 SHA-256: d9221b8b78f1fc9fcbcc10d4674cadae2191751d51a65e535a753b8ed60b8b1a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The ML classifier and critical heuristics strongly indicate malicious intent, likely to trick users into visiting a malicious site for potential credential harvesting or further malware delivery. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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/431946152/codes-to-get-free-robux-game-hack In PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/apocalypse-games-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/script-lua-roblox-hack-github_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-roblox-items-catalog_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/pastebin-free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/adf-ly-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-roblox-jailbreak-money-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-ultimate-driving-v3rmillion-free-gamepass_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-how-to-increase-speed-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-us_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-fly-hack-unpatchable_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-hack-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-without-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-hack-roblox-with-terminal_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/roblox-vehicle-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/lol-robloxcant-patch-the-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/redeem-free-robux-code_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-do-you-get-free-robux-in-roblox-2021_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_off00002eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EEE 21456 bytes
SHA-256: 72c78b2ff394231eab922cb8a312d51b245fe0e615ce1661655387a142248980
font_01_sfnt_off00005db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB4 18996 bytes
SHA-256: dae15d86f19837a25368e9980f7c547d0fc236531c79ecd70a0408dcd8fbc7fb

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