Malicious PDF — malware analysis report

Static analysis result for SHA-256 580c49f3faf4a4c9…

MALICIOUS

PDF

52.2 KB Created: 2021-06-08 22:45:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 51665bcf5eb83a81e2eee21c1fd68105 SHA-1: 9a8250004684f2777647adef29d162ca50444c8d SHA-256: 580c49f3faf4a4c9dacf31d745c83242d19798dac1cbc441d1fd3edb5ea1a573
90 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to external URLs that are associated with game hacks and generators, indicating a lure for users to download potentially malicious content. The ML classifier also flagged this PDF as malicious. The primary lure appears to be related to Roblox and Minecraft, suggesting a social engineering tactic to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/how-to-create-a-roblox-game-for-free-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-girl_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/tiktok-free-key_GM835599320.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-got-talent-piano-hack_GM431946152.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_off000050a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A4 33920 bytes
SHA-256: d6bf66dc162b23f050b661b5f32da56616fa377fe77a059796cab6d07938b130
font_01_sfnt_off00009b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B22 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA834 18704 bytes
SHA-256: 2af6af82502dbc61f5abd164a4b349d9390166635c95807913c0b0c9bb9fc17c

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