Malicious PDF — malware analysis report

Static analysis result for SHA-256 b642e05f38b8786e…

MALICIOUS

PDF

44.7 KB Created: 2021-06-02 23:13:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e76b81c21f8363d6e2f8605c7ba85877 SHA-1: aba30b3d5134948749776a4018cf424bb7f3893e SHA-256: b642e05f38b8786e6829b23947f0710a43e4912b365d30d45845f559c7edcf15
142 Risk Score

Malware Insights

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

The PDF document contains a lure for game hacks and fake CAPTCHA prompts, directing users to a malicious URL. The ML classifier also flagged this PDF as malicious. The embedded URL is likely intended to download and execute a second-stage payload, potentially exploiting client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-roblox-scibt-pack-exploit-game-hack PDF link annotation
    • http://interpretation-dessins-enfants.net/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/op-rewards-free-robux_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_off00005233.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5233 24596 bytes
SHA-256: 7c1b41eaf6f82b0807d67abb62b202a75c362da12e4d2a9e8ed07db1118a9611
font_01_sfnt_off00008a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A55 18900 bytes
SHA-256: 7e587f401894273e1906db02c142e6734ef9932d24020be2f2cfe08755faa103

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