Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdfc18c4b29e84f…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 06:05:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d05fe4141783c46eaf935b3f261f9deb SHA-1: 329b8d79651be7a96409ccffc20e5255e34ce53a SHA-256: 5bdfc18c4b29e84fd5421cb4342e6f45cdbe5016d823c804031b72d9ed830bfa
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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.online/app/431946152/how-to-get-free-robux-fast-and-easy-game-hack PDF link annotation
    • http://perpus.wdh.ac.id//repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/tiktok-free-likercom_GM835599320.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-minecraft-alt-accounts_GM479516143.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_off00004e06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E06 24780 bytes
SHA-256: 8958b1fa158e57e78de22a7b330753f85767cab64cc5f155d936f06b3a847917
font_01_sfnt_off00008687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8687 18864 bytes
SHA-256: 264ac3d9ee16189788a918c90b00fec891485e046f110455159a23ab28eb8c09

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