Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76243b25d16ea71…

MALICIOUS

PDF

46.8 KB Created: 2021-06-09 16:13:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 328f4e0129feabaa79f9fff7caf7a76f SHA-1: 28b81870b5900d7d50e4c5368c4a76a4efde29c6 SHA-256: e76243b25d16ea711f068e42d8c9350b40f27f2ceb57e37b6adc9da9a7845a82
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as game hacks or generators. The document contains multiple embedded URLs, including a primary redirector at `https://netcdn.tw/app/431946152/heroes-online-free-roblox-game-hack`, which likely leads to further malicious content or downloads. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/heroes-online-free-roblox-game-hack In PDF document text
    • http://taxi-1411.de/images/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://taxi-1411.de/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://taxi-1411.de/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://taxi-1411.de/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://taxi-1411.de/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://taxi-1411.de/images/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://taxi-1411.de/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://taxi-1411.de/images/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://taxi-1411.de/images/wurst-commands_GM479516143.pdfIn PDF document text
    • http://taxi-1411.de/images/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://taxi-1411.de/images/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://taxi-1411.de/images/coin-master-free-spins-2021-blogspot_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
font_00_sfnt_off00004e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E22 25068 bytes
SHA-256: 46647ea3a5cdb1b06ff17e8106a283a277f4321524daa30fbcf465becf46a4e2
font_01_sfnt_off000087c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C0 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000094d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D1 18068 bytes
SHA-256: 9400bb9e0661e7c42a78458b20f808adc40bba17735d398e8a2131ca7cb33ad0

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