Malicious PDF — malware analysis report

Static analysis result for SHA-256 998c93c4c60e86e8…

MALICIOUS

PDF

41.2 KB Created: 2021-05-16 23:35:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 96a14b731dfff422b8580fd56c83e697 SHA-1: 6d8b17d871755901c8d222f4fe54b37e46827741 SHA-256: 998c93c4c60e86e8ced4f6c24be1b7100db102841c41fb90ad697b90229388c9
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free spins. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicate a phishing or scam attempt. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into further interaction, likely to download a secondary payload or visit a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/freespins-coin-master-game-hack In PDF document text
    • https://cluster-consulting.com/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-free-login_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/easy-robux-com_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/minecraft-114-download_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-games-coin-master_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-free-robux-without-verifying-2021_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_003_off000048b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B6 24160 bytes
SHA-256: 1d4b5839fdc9c895d7acc5c55fb92918dd8d363d123c87292fbff15fac34c029
font_01_sfnt_off00007fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB9 17884 bytes
SHA-256: c31d741d4f965ff4f04c8652eedf0010194718e591e89cbf3157ab9f7afc750f

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