Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e94f5a531e4a78…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 22:51:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 82683ebc424b00dc0692198170033287 SHA-1: 38b46412d490ec9815cdb39ecee93fbc7e5b39cc SHA-256: 80e94f5a531e4a78cd6faf6a934ab97f0cc9af07058f4508351f961691ec5e22
300 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and a game hack lure to deceive users into clicking a malicious URL. The document contains multiple links to redirector infrastructure, including a critical finding pointing to 'https://netcdn.online/app/406889139/coin-master-free-spins-daily-game-hack'. The presence of a fake CAPTCHA with command-running instructions suggests an attempt to execute arbitrary code, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • 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 with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/406889139/coin-master-free-spins-daily-game-hack In PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/www-rubux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-cmds-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupangIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005204.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5204 25916 bytes
SHA-256: 573218f897a7bf563ab4a24b2ef42e0cdda0e63fe6aef029bb989f3bec4ba480
font_01_sfnt_off00008ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CED 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000096a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96A0 18308 bytes
SHA-256: 220bb6194b1ab8a2bb399ca4a862914ac8d15b354bb0df2c737bc67699221dc9