Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6038dcbfe8cea2…

MALICIOUS

PDF

49.6 KB Created: 2021-06-10 17:49:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3c1ee0f846ba11409169e50532a75947 SHA-1: d322436c668d21dd4951929886a0398cf0061880 SHA-256: bc6038dcbfe8cea2f149f7bd61c5cef898a37a0a21cb0eaee563fa1731f80bcd
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

The PDF document employs social engineering tactics, presenting a fake CAPTCHA and instructions to copy/paste a command into a terminal, a pattern consistent with ClickFix attacks. This is intended to trick the user into executing malicious commands, likely to download and run a second-stage payload. The document also contains numerous links to potentially malicious websites related to game hacks and free items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 8

  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/how-to-hack-any-roblox-game-with-scripts-game-hack PDF link annotation
    • http://digilib.akperkabpurworejo.ac.id//repository/tiktok-free-views-apk-download_GM835599320.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/roblox-owo-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/cheating-roblox-thumbnail_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/all-roblox-dance-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/minecraft-education-free_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_off000052f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F8 27048 bytes
SHA-256: 958eb0d73531b16e0d0a6e4f486e5e5bad1d3d76428f62290ee9f22678e6a24c
font_01_sfnt_off00009184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off00009b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B46 19552 bytes
SHA-256: 9a1ec9bbdf96abb39dd3e474abeab672f741d8494aee04f4b920524eb117cf72

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