Malicious PDF — malware analysis report

Static analysis result for SHA-256 b204c3abb58cfd6e…

MALICIOUS

PDF

48.0 KB Created: 2021-06-10 18:33:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 05eac497a81c5328a8f598e48a91054d SHA-1: 56469cda5e6c5120d7019f32cf376fc549594673 SHA-256: b204c3abb58cfd6e8648cb8581ab9cfb6e9f6543bf845ad90e68a3a740004307
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9796

Heuristics 4

  • 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.tw/app/431946152/hackaron-roblox-robux-hack-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/mosttechs-coin-master-free-spins_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_004_off00005475.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5475 24360 bytes
SHA-256: 52f421a08e820d6ff5efd5c296aa2af4ed426d2f5d96a8145cf308a3418f7e58
font_01_sfnt_off00008bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCE 3944 bytes
SHA-256: 081569ec119746cc4db5e65c324be5d90361ff1f928a16f4e5d08db70348f444
font_02_sfnt_off000098b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98B8 18320 bytes
SHA-256: 99f64b0e4d40976744576da42e0caa9a18393f55b6750d5245a9b59c101ad45c

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