Malicious PDF — malware analysis report

Static analysis result for SHA-256 041f655c2a6adf55…

MALICIOUS

PDF

43.9 KB Created: 2021-06-09 00:07:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: de5548ba8c3a61e3acda81265e3fad91 SHA-1: ca72d9025aeacdb5c4f20131ab91391b27bdf32d SHA-256: 041f655c2a6adf55961fd9d11684f362b402a2317f78ebe600aca7010d0d243f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains embedded URLs and a visual download button lure, impersonating PayPal to trick users into clicking a link related to Roblox hacks. The primary malicious URL identified is https://netcdn.tw/app/431946152/hack-2021-roblox-ap-game-hack. While no scripts were explicitly extracted, the ML classifier and brand impersonation heuristics strongly indicate a malicious intent, likely for credential harvesting or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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/hack-2021-roblox-ap-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/hack-2021-roblox-ap-game-hack PDF link annotation
    • http://repository.ummy.ac.id//repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-free-robux-obby-limited-time-only_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A0 23920 bytes
SHA-256: 032d12aad23ab0aaf5fb9a16eb5eef4523d676c459d9921fe2c2bc7dcb294bab
font_01_sfnt_off0000872f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872F 18760 bytes
SHA-256: b8e6cf4eb1eebbbf7e433b6c9bfcd7002d28a55f889fb4903d5fad74ca767efa

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