Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5739d72f52bf2f…

MALICIOUS

PDF

45.3 KB Created: 2021-06-08 23:33:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 34aa854bc7fea297995e20c2c05e2070 SHA-1: 1a59f63375316adb0979e6e219b234c3ed77f6d7 SHA-256: 4c5739d72f52bf2fae08025c944443d9f7734c52755d43a3be45a7c09aa4ea8f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a game hack, redirecting to a URL that appears to be part of a link farm. This suggests a social engineering tactic to drive traffic or potentially distribute further malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent to mislead users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/fly-hack-exploit-roblox-game-hack PDF link annotation
    • http://library.forda-mof.org/katalog/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-roblox-logins-password_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-hack-on-roblox-in-3_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/rbx-com_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/cheat-roblox-tower-battle_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-controversy_GM431946152.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_off00005347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5347 26436 bytes
SHA-256: a822289a11237eb49e4ef8d2860cf7f95cf5a9da889a7ea442ba47313e65d0b8
font_01_sfnt_off00008c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C96 18924 bytes
SHA-256: 66f16fd07b6daca034c00108488bfba1b3f0ce75b1df2d8f70713ea5e5fd7802

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