Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb7c5847f71f9fb…

MALICIOUS

PDF

49.5 KB Created: 2021-06-08 21:27:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 27095dfcf28a5143fb6f2669e5d5e07f SHA-1: fd10080cdaca27e51908f1ad59eec87812750ffa SHA-256: dfb7c5847f71f9fb52c4b67bc67bb56ff337908760016077f82b0573252199d9
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and displays a fake CAPTCHA to trick users into downloading a payload from the provided URL. The ML classifier strongly indicated maliciousness, and the presence of a fake CAPTCHA heuristic further supports a social engineering attack. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/get-free-robux-no-scam-game-hack PDF link annotation
    • http://anna-art.in.ua/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://anna-art.in.ua/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/roblox-ninja-animation-hack_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/free-roblox-oder-accounts_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://anna-art.in.ua/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://anna-art.in.ua/images/free-online-minecraft-server_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_off00004f7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F7E 27488 bytes
SHA-256: c27d125aa6f3f54c09ca3f5999fcfa93f700030eb01f0fb3e73aa4727ff2ac20
stream_006_off00009e15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9E15 18608 bytes
SHA-256: 5d08041d96e670fd0e7ff93c1509b6c46d433df82498779b994deaae9ae2e2b8
font_01_sfnt_off00009103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9103 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139

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