Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff214c0e53d0f7a…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 18:07:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7a49518055c792f4363a8a0d1820a57a SHA-1: 12e4a849cc4219fcc011a9be73da4ef0027d2530 SHA-256: bff214c0e53d0f7ad4c18e74a40eec66aaa315761b2a96690f49db1ecab96540
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to deceive users into clicking a link. The link redirects to a malicious domain, likely to download a second-stage payload or exploit a vulnerability. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/coin-master-hack-ios-jailbreak-game-hack In PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/robux-prices_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/pubg-uc-hack-2021_GM1330123889.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_off00005239.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5239 25308 bytes
SHA-256: 3a755fda1b422b29812943bb55d54c10755aa4366fee86b331c268cc7a685198
font_01_sfnt_off000089fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FB 18112 bytes
SHA-256: 1b0308d5ac0dfb41a556ba6c26081d7047b70f811c924827bde711dbba141842

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