Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22738ed8b3ae3c8…

MALICIOUS

PDF

48.0 KB Created: 2021-06-03 13:23:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 653397fa829dfb4b8406f070999627f9 SHA-1: 2fc7d52c47b47a21f5145d696617e78b79fda076 SHA-256: b22738ed8b3ae3c8732890cad8e050013bdb10d5a44016b942a3362476c8bc14
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as game hacks and generators, which is a common lure for users. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is used to trick users into interacting with these links. The primary link identified is https://netcdn.online/app/431946152/how-to-get-robux-without-paying-game-hack, which redirects to further malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/how-to-get-robux-without-paying-game-hack In PDF document text
    • http://suaedy-library.net/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/worst-client_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-game_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-coin-hack_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
stream_004_off00005278.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5278 24784 bytes
SHA-256: 69a57cfd9eec7cdaf5bcc348cf6f2681d0e0173b1eed55b40e89c04659c5d0ba
font_01_sfnt_off00008b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9E 2872 bytes
SHA-256: 471b34484c3bee8d5bebbf3396bad215506385dbde547a2422db70e8efc075b4
font_02_sfnt_off00009558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9558 19452 bytes
SHA-256: f617277b03f9c5e21d6c79dcd1607af3478f90b0cb5df5fc079a11a568c69004

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