Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb7289b2199b200…

MALICIOUS

PDF

46.6 KB Created: 2021-06-11 11:17:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c374713565024146610d1639b50db110 SHA-1: d4f7231169080daffbcf890f811957c893fdac01 SHA-256: ecb7289b2199b200e25dc4e7a915d9e4c8fb93ee2c623859966e35665dcef0d4
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators. The primary malicious URL identified is https://netcdn.tw/app/431946152/bloxburg-roblox-free-download-game-hack. The document body, though heavily obfuscated, contains references to similar lures, reinforcing the social engineering aspect. The presence of embedded URLs and the ML classifier's high confidence score indicate a deliberate attempt to lead the user to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/bloxburg-roblox-free-download-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/pubg-uc-alma_GM1330123889.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-rapidit-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/tiktok-likes-free-trial_GM835599320.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-wings-promo-code-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-roblox-2021-script_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/delta-roblox-hack-buy_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-boy-clothes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • 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_off000052ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52EA 26756 bytes
SHA-256: 54914f22b3c769847f89680730b6f5a7217ca40a199ca044ede1f7b4c9a0ddee
font_01_sfnt_off0000912e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x912E 19108 bytes
SHA-256: 212faf14d8861e8485433ef48628bb456b7eab77a5a5c2ae4ba00f2aacf0d671

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