Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcc8d812eeed432…

MALICIOUS

PDF

33.4 KB Created: 2021-06-19 13:11:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c166f4d57e599a81cdb9fd6877970747 SHA-1: d1081703bf36d308891dbab172fa8138caec44c6 SHA-256: efcc8d812eeed432c9d8f7cd2c263303969e30f0bcceb78d0860f26e812e7b83
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. The primary link, http://netcdn.co/app/431946152/hacker-face-roblox-game-hack, is associated with known malicious redirector infrastructure. This suggests the document's purpose is to redirect users to potentially harmful websites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hacker-face-roblox-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/play-robloxcom-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-wallpaper-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-hair-roblox-boy_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
font_00_sfnt_off00002e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E81 21680 bytes
SHA-256: 974bbd908849a10d03951f57e10044bd6a595a629ad34d6d409567e152a4b85c
font_01_sfnt_off00005e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 18820 bytes
SHA-256: cd2a88f5b0329b85a43e9cadfecdea260aeecc47a094d313265ad531b46bc857

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