Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d71e92bbd30be7…

MALICIOUS

PDF

45.7 KB Created: 2021-05-17 10:34:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f8c3e44bc93264ce26e9eaba3164d7e5 SHA-1: 3126c39d4642c1e6733b5013984a82244deb138d SHA-256: 71d71e92bbd30be71d291db6b2d8945abab0f89c3e83284a55104424dfb89cde
142 Risk Score

Malware Insights

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

The PDF document contains a lure for game hacks and free spins, directing users to external URLs. The critical heuristic for 'SE_SECRET_RECOVERY_LURE' indicates the document may attempt to solicit sensitive information like private keys or passwords. The presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent to deceive users into compromising their accounts or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-spins-link-today-new-2021-game-hack PDF link annotation
    • https://mayastisingkawang.com/__statics/gudangsoal/files/_GM479516143.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/roblox40com-robux_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/free-coins_GM406889139.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/robux-best_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://mayastisingkawang.com/__statics/gudangsoal/files/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A54 24860 bytes
SHA-256: 2863ca1df7d018508a77e7fc6d0e35c8a4f0141497453e9797b67793604ebca8
font_01_sfnt_off000083c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C2 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAD 18976 bytes
SHA-256: 9ab4b87832590d82aec569b9c8693c2016d5d9151569e528de1ed13ad8a1cb2c

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