Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ad3398cfaf2087…

MALICIOUS

PDF

46.6 KB Created: 2021-06-10 15:22:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 87b187c011da723f59c730c239380784 SHA-1: 1d3c1d5eca2db9781a3277f046946e526b139c80 SHA-256: e1ad3398cfaf208751dc1175963fea5e2038ad5a88af24652176664c74a1bfef
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, a common social engineering tactic. It contains multiple embedded URLs, one of which is `https://netcdn.tw/app/431946152/free-clothes-on-roblox-id-game-hack`, likely serving as a lure for a malicious download. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • 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
  • 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/free-clothes-on-roblox-id-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/gamecraft-org-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-intriga-injector-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/are-there-any-roblox-games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-no-survey_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_off00004f84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F84 24924 bytes
SHA-256: 1ce7837ab385f31f6b334de8dce8a5dad065d8353b68597d3c3b11682be0e8d2
font_01_sfnt_off00008954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8954 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9305 18392 bytes
SHA-256: c35ff7c9c2f1f2845faec8b7cbfc9c36ed2865f16c55d715f509684f380ea6c0

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