Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca1853945032b2d…

MALICIOUS

PDF

34.3 KB Created: 2021-06-29 05:46:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bc083ceff3dff74384793c493d21ccc2 SHA-1: 77cbd9fb6dc2343bda62a2d1d43d51bcec358ff8 SHA-256: 7ca1853945032b2d8d98249ad1e2b92204e57a0a4aaa3205aac65f3fe3553e05
82 Risk Score

Malware Insights

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

The PDF document employs a common lure of 'free game hacks' to entice users to click on embedded links. The primary URL, http://netcdn.co/app/431946152/how-to-free-robu-without-free-robuxs-apps-game-hack, is flagged as a redirector to potentially malicious content. While no scripts were extracted, the PDF structure and heuristics strongly indicate a malicious intent to redirect users to a compromised site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-free-robu-without-free-robuxs-apps-game-hack PDF link annotation
    • https://mbbs.hr/files/make-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/2021-february-roblox-noclip-hack-for-prison-life_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-no-tix_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/master-game_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/wright-your-password-for-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-no-human-verification_GM406889139.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_off00002e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E30 22088 bytes
SHA-256: 66bf0feaf9e4352091e59d8fe792a7614fdd72ea46e7efee4b3d1a21e925b5a1
font_01_sfnt_off00005f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 19644 bytes
SHA-256: 7c67acdc4308c66567f2c4eb5b567c8760cf44f5925095b035b121b7533ebc4d

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