Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3fccc83c0c6a03…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 09:09:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d31b9494d0750c226770df391d9db3b8 SHA-1: 6e60b3feae191579b30897e44998754349e6a7f9 SHA-256: 6c3fccc83c0c6a03bff93b28ea05748cb7ec1ba027c9536b8740e81363240e7e
200 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a game hack generator, aiming to trick users into clicking it. The presence of a fake CAPTCHA heuristic further supports the social engineering aspect of this attack. While no scripts were directly extracted, the embedded URL likely leads to a second-stage payload or phishing page.

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/i-cant-get-free-spins-coin-master-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pubg-uc-free-redeem-code_GM1330123889.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-apk-35-13_GM406889139.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_off00004ed9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED9 26028 bytes
SHA-256: ca61b4e1c3b30f59cf4699cc010a8b9c5dd897ac0ac4c4920eed97ca33518889
font_01_sfnt_off00008a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A83 17884 bytes
SHA-256: 5820efde9e5fe16aed3c977de96073b5a9ded1f6c80170346f50cb4654f88eb8

Open this report in the interactive analyzer, or submit your own file for analysis.