Malicious PDF — malware analysis report

Static analysis result for SHA-256 0168885253e9f564…

MALICIOUS

PDF

49.7 KB Created: 2021-06-11 08:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9514a252ac1c8e3dcae8a14547027adb SHA-1: 7bd32791085d09961a1046f24c40ea09b20a6fa7 SHA-256: 0168885253e9f56448ecd305684e6b18cede8a2f71fe3c109f658c39ead170a3
82 Risk Score

Malware Insights

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

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 download site. The ML classifier strongly flagged this PDF as malicious, indicating it likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/hoe-to-hack-free-robux-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/free-minecraft-packs_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/mad-city-cheat-roblox-kill-all_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-anime-fighting-simulator-free-vip-server_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-spin-cheat_GM406889139.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_off00005332.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5332 33948 bytes
SHA-256: 6ae4d4d130105b13a1c1c574ab218ee48fa0f276c4bc88f9ff91f448ac9a0528
font_01_sfnt_off00009f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F96 18412 bytes
SHA-256: ae12d3a57cad780a84af0d8b65abc1f154fbec1282e3215a93e52aa141bd98f8

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