Malicious PDF — malware analysis report

Static analysis result for SHA-256 4430bb423cc32dc4…

MALICIOUS

PDF

45.8 KB Created: 2021-05-10 20:36:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5f2ff229b8b969d95bbe1df0c8421c4f SHA-1: 89122c736b14b2d42ff511345433ad87dc3d4d84 SHA-256: 4430bb423cc32dc42f556efb643801abf38cbd4da8ac98f21165ab417bbb39bd
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. 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 0.9432

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.
  • 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
  • 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-in-app-purchase-hack-game-hack PDF link annotation
    • http://librarysenior.com/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.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_off00004b01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B01 26412 bytes
SHA-256: c22e1261840da2455750d20e32ee101fb58f00b9739719d420ca008675d74472
font_01_sfnt_off000086f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F0 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000090a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A2 18352 bytes
SHA-256: 37c61889bff08c2bddd56bfb017dd32b1bdcae49f78bbe236cb4c9fcda307a6c

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