Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba1bcfb9826d970…

MALICIOUS

PDF

45.2 KB Created: 2021-06-02 13:45:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9c95d2688c2c697d8c0c1d7e45dfbd43 SHA-1: 51b9e32b5dc3e2deeb0047d96942eeb440a9f844 SHA-256: 6ba1bcfb9826d970a53e51b7efa6adb060bcf6809810d752294d14e4f9a84cf9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds multiple URLs, including one pointing to a potential exploit or download site related to game hacks. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.xyz/app/431946152/free-obc-roblox-accounts-2021-game-hack PDF link annotation
    • http://hardbit.cn/images/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-hack-server_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/is-pokemon-free_GM1094591345.pdfIn PDF document text
    • http://hardbit.cn/images/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004bbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBC 28460 bytes
SHA-256: 6ee7cc8a2ec49345e59d5a48b85485b7fd3b7b2ce77ca9dc3a6dd0c2e99912bf
font_01_sfnt_off00008d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2F 18596 bytes
SHA-256: b559bb9a23201a786cf592cc0d60379319bd1e91bb6442778c04db3f8ee20967

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