Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81555718a76fa07…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 19:41:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4052f8289bd5d0b4ce7e5cc2c20c4cb7 SHA-1: fb0146118c8a4234a7ba19a72062202f38ece61a SHA-256: e81555718a76fa073bc783cb055868a2b48fde1cc63fa68900ec9b7fb8a6947a
122 Risk Score

Malware Insights

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

The PDF document contains multiple lures related to game hacks and free generators, directing users to external URLs. One such URL, http://netcdn.tw/app/479516143/minecraft-server-free-trial-game-hack, is flagged as a high-severity lure. The document also provides instructions for a password-protected archive, a common tactic to bypass security filters. The ML classifier strongly indicates maliciousness, suggesting the document is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/minecraft-server-free-trial-game-hack PDF link annotation
    • http://librarystkippgribl.com/repository/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/robux-apk_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-skin-roblox-strucid_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-hacks-wurst_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
font_00_sfnt_off00003308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3308 22288 bytes
SHA-256: 68ef8136be01f3ae18a2e5caa81bd534d8f56bd15895b6740e08bd045359f5df
font_01_sfnt_off000064bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 18044 bytes
SHA-256: 5a296e18dbf65f04870817c9dd6793c8643020e9f41ce66c5e33f12cc84b0da1

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