Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdd06d79a8e7a5f…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 19:18:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f5433c0d257ea9b9e868b9158543a32a SHA-1: 62e479c6d3676b7a58657a72e1db71611e434ab3 SHA-256: 4bdd06d79a8e7a5f16de040eeadf6baa0ada9af74be4894f83498d6df3fee413
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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 https://netcdn.online/app/431946152/roblox-booga-booga-cheat-codes-game-hack PDF link annotation
    • https://cuc.ac.cr/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/earn-robux-websites_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.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_off00004ecc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ECC 24220 bytes
SHA-256: f69f3321d2395ad69938fc952cd39a785e9ecb17c19abc1edcc4f66ba07923d4
font_01_sfnt_off0000855c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855C 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9203 18744 bytes
SHA-256: 703fc57bafdc15d4c10fa9d9cb9125d9b858a070610ea4b9012d58f6436c4dbb

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