Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a206e091046b77…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 12:39:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 38aa836017f126b8e8748562945d1fed SHA-1: c0fc8e45cb01d58b55dc6247876f902975a1f778 SHA-256: 39a206e091046b772cad015d9ee630167674561a74b8ea431b9863fafa76f2da
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to known malicious infrastructure. The document body and embedded URLs reinforce this by advertising free rewards and game hacks, aiming to trick users into clicking the malicious link. The presence of a 'password-protected archive' lure suggests an attempt to bypass security controls by encrypting a subsequent payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/406889139/free-rewards-coin-master-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-obby-no-password_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/cheat-engine-64-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/pokemon-go-free-trainer-codes_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-hack-robux-4_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-roebucks-no-human-verification_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_002_off000030c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C3 22972 bytes
SHA-256: fe24131aaea5e7485f2c049c67dc4240a5ec881ca1f2e7cfb5d8acd02840e8eb
font_01_sfnt_off00006467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6467 18336 bytes
SHA-256: 7c31d9928eb7aaa57f30cf4b6a63d2b4a10137116a6e89aed895616d77e52333

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