Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fccbe55dd4fae8…

MALICIOUS

PDF

44.8 KB Created: 2021-05-10 23:32:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: be0d536eea0423165f5ea39e47e4d13a SHA-1: 4c456d1a1d68a453279b714d952a1272aab3813a SHA-256: c5fccbe55dd4fae8d2d8f5c8f28a03a68d9f02d22fb7fa24314d36768179e111
260 Risk Score

Malware Insights

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

The PDF document contains a lure for free game currency and hacks, presenting a fake CAPTCHA to trick the user into clicking a link. This link leads to a known malicious redirector infrastructure, indicating a phishing or scam attempt. The document's structure and embedded links suggest it is designed to exploit user interest in free in-game items to redirect them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/coin-master-hack-spins-and-coins-unlimited-free-download-game-hack In PDF document text
    • https://www.bumbar-sport.hr/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/minecraft-handbook_GM479516143.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/my-robux_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-daily-free-spins-link-2021-today_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_003_off00004954.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4954 25504 bytes
SHA-256: afb9371bdb5c9e60193d8f24e8de1159ed94050113b070a877527ee8f886cea9
font_01_sfnt_off0000802f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802F 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A48 19084 bytes
SHA-256: 3caa8a7d0fc813cf6f5b32cad2d70b7396c8f8504cee304b3b4cfd76b23e4d42

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