Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc4cbe05aa9aaf8…

MALICIOUS

PDF

48.7 KB Created: 2021-06-08 17:51:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bae50b982beee0551d89cb0928fd29cd SHA-1: af9d70b6c3043ba68a6df499d177aa8bd6323257 SHA-256: 5bc4cbe05aa9aaf872808e28bfd48f29506d8bb3a61ea2c11a86eee4c2dc121a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and currency. The primary link identified is https://netcdn.tw/app/431946152/pastebin-roblox-robux-hack-2021-game-hack, which is associated with a 'free generator / game hack' lure. The presence of multiple similar URLs suggests a campaign focused on exploiting interest in popular games like Roblox and Coin Master. No scripts were extracted, but the document's structure and embedded links strongly indicate a malicious redirection attempt.

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/pastebin-roblox-robux-hack-2021-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-without-app-download_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-free-pc_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/pig-master-coin-master-free-spin_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_off000055b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55B4 25072 bytes
SHA-256: 27dd96aab75ddbcfb36fd2519f3fdfec400bb8845097a896f2f0b85fb082776a
font_01_sfnt_off00008f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F57 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off000098f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F8 19100 bytes
SHA-256: 95ee48287d63263b942a23aa4ae927270c1839fc47f2bf77dab6aec6c0d892e0

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