Malicious PDF — malware analysis report

Static analysis result for SHA-256 4251d9b44c7aa51f…

MALICIOUS

PDF

46.9 KB Created: 2021-06-11 12:31:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-15
MD5: 985ec3e274528829ace9786658b986e2 SHA-1: 53480fe0266ed20bcc87c6b8aeafdf066db65f25 SHA-256: 4251d9b44c7aa51fd17406a0b2311d383b2eeb34fd36baa85e1eac7c51496b2e
200 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/roblox-cheat-engine-saber-war-level-up-game-hack.
  • 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/roblox-cheat-engine-saber-war-level-up-game-hack In PDF document text
    • https://perpustakaan.stifar.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-hack-download-games_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-free-robux-january-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/get-robux-for-free-on-your-browser_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-hack-tix-and-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/rbx-hut_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/robux-no-human-verification-2021_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
stream_004_off0000501e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501E 28904 bytes
SHA-256: db46cfa2f3f9d8e75640d031be5255dad94bf7f9826e05924b1db70d33ac5158
font_01_sfnt_off000091ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91AB 19364 bytes
SHA-256: 6a0a9ae6167974970c9ca93c9ce948aec9ff1cab74d2cc1760c80ab13963eb21

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