Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ff59e884e8d50b…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 06:37:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 185bafa040a35981706ddab829c2a2c2 SHA-1: 524ce22826f42556182954da9ec64e7a06c0461a SHA-256: 41ff59e884e8d50bd6ec7bb11b7d08d19966ca76e9f67754a25b7e7e3b974b9e
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-robux-websites-that-work-game-hack.
  • 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.online/app/431946152/free-robux-websites-that-work-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.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_off00005033.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5033 25272 bytes
SHA-256: 3ffbd424053b87cfb1a0cecc366a4348ff07c3de3db5c77c8cafef4d2521bedd
font_01_sfnt_off00008ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC6 19000 bytes
SHA-256: 7385cf8e30761df55e83d9792ae8d47179260988159899b0069d718a962ca50a

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