Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fc37ad17057021…

MALICIOUS

PDF

43.1 KB Created: 2021-05-12 07:05:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 30b1b3a6530719e0dc916cb10d79217d SHA-1: c62440d8192fe3ae8098544685ceaa81e73e7dac SHA-256: d5fc37ad17057021c81285cf5526250ed07fbb1bce5e7e83a72fb86b2b5003dc
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 a malicious link. This link, 'https://netcdn.xyz/app/406889139/coin-master-free-spin-app-2021-game-hack', redirects to further malicious infrastructure. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/coin-master-free-spin-app-2021-game-hack In PDF document text
    • http://lib.mbp.ac.id/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-roblox-passwords_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
stream_003_off00004b7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B7B 25880 bytes
SHA-256: 585df7150b1c853da7eaeb0f971eae86d9164a00a7f802232350c259c1283fde
font_01_sfnt_off00008635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8635 18288 bytes
SHA-256: 9e45682e75c9d32c9cdd141c5fab5a724451df36257687b071ab62572bb469d1

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