Malicious PDF — malware analysis report

Static analysis result for SHA-256 831fede910f295c6…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 14:20:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 83bb6485f4d9c9838a588c6fd3ef29cc SHA-1: a0129c37fd85483d6a8a15360f7b8bcadfae0a15 SHA-256: 831fede910f295c6e19910dd5f7e6e08da520d473e27192d8d43934866ba28c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a malicious redirector, disguised as a 'free generator / game hack'. The primary link, http://netcdn.tw/app/406889139/free-spin-link-coin-master-today-game-hack, is flagged as malicious. The document body and embedded URLs reinforce the lure of free in-game items, aiming to trick users into clicking through to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/406889139/free-spin-link-coin-master-today-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/tower-of-hell-roblox-hack-mobile_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-in-roblox-games_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hack-apk-android-download_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/easyrobux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hack-dll-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/cheat-codes-vhicule-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-base-terrain-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-glasses-code-to-get-for-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-pastebin-code_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/sites-for-free-robux_GM431946152.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_off000031ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AC 22424 bytes
SHA-256: 62657e4c7fdda07223a8f826cd821091fac741707df1bbca09dbf7710ced6564
font_01_sfnt_off00006398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6398 18696 bytes
SHA-256: 31881190b33b808cb817da8829c891faee4b93e4bfb09ae76d7fe90b75b9481b

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