Malicious PDF — malware analysis report

Static analysis result for SHA-256 7468c28fb9237d0d…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 08:02:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 44b919cd24faf8d2b990dbf2c7cddec5 SHA-1: a24c86c98183674c97c3eecc6ed8091d083c3f6c SHA-256: 7468c28fb9237d0d028d20246650fbe68b1888249040fbbc46cc3d6d910ccfc9
182 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, specifically advertising 'free generators' and 'game hacks'. The numerous embedded URLs, including 'https://netcdn.online/app/431946152/free-roblox-accounts-with-robux-2021-game-hack', suggest a link farm designed to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/free-roblox-accounts-with-robux-2021-game-hack PDF link annotation
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://che.itk.ac.id/asset/backend/upload/ckeditor/files/free-spins-on-coin-master-game_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
stream_004_off0000556c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x556C 26676 bytes
SHA-256: 4af7c2fdfa6804d2dda7fb4b234ce8a44d921316812260ad39736c921dd2a013
font_01_sfnt_off0000907d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907D 19076 bytes
SHA-256: c054b0c192e62aa8d18573c4a3caef3c11adbf34d317da17e190ba3718f8ceb0

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