Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4052f5d4968eb9…

MALICIOUS

PDF

48.8 KB Created: 2021-06-10 13:31:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 150bf61190e3a6348a2c5736eab3e98f SHA-1: 70f85be8bab33a424492d1fd5ae6a70d27f42e57 SHA-256: ef4052f5d4968eb986705bfe9be8b01ec806c033c30b37cfe14e4189bd669e80
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free Robux' and game hacks. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malware downloads or phishing pages. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-roblox-2021-game-hack In PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/robux-com-for-free_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/tiktok-free-music_GM835599320.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/how-to-hack-a-old-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000537f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537F 26724 bytes
SHA-256: 875396f78f417cad8b062c8a058706677cbce1002778f2a65081678c89b878f2
font_01_sfnt_off0000919b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x919B 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4A 18488 bytes
SHA-256: 0c5d27d9d2ab7135fe00c9a3763cf59610c13e372ef3303df75356d25b30acd0

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