Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd77babe3117b49e…

MALICIOUS

PDF

47.8 KB Created: 2021-06-08 12:42:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-18
MD5: 5431ea1f5f17ac722dddb46a57a5ab32 SHA-1: e0285db4a4ef2a5433f7bc4ab3c2b70f52c6831a SHA-256: cd77babe3117b49ee00868023bdb7201f8b754d82e40b3cab48878aae86a41be
140 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/2021-000.000-free-robux-game-hack In PDF document text
    • http://perpus.stmik-im.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/jailbreak-script_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/worst-client_GM479516143.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_off00005163.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5163 25996 bytes
SHA-256: d525829c0c129ae9a70b024966bc28dfc579ae4d94d0bc1354a1756735d65b51
font_01_sfnt_off00008d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D64 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000974f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x974F 18480 bytes
SHA-256: d4c58ea29f94e1942e822e6fe2f687a6297308096c0f1f3520c453b563c16188

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