Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f9b79c7ec0899f…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 14:02:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a2665b5d8facfbfb25adee3bcb5adc9e SHA-1: 964fe88e45daeba4b3343f9c86e1ce67bda857d3 SHA-256: 29f9b79c7ec0899fe3a7b1b9b4a62e53a357e812c2d959dd52d8ad4ad9129593
82 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a lure for game hacks and redirects to a malicious URL. The document body, though partially garbled, mentions 'Free Robux Promo Codes 2021' and the primary malicious URL is associated with this theme. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to trick users into downloading or executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-promo-codes-2021-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/robux-apk_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-free-99_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/pubg-uc-dundle_GM1330123889.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-tiktok-video_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/get-free-robux-no-human-verification_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_off00004e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E27 26032 bytes
SHA-256: 36dcda174023b750af40a01a157ed1fd5c6b889ddcad046af0a96f6d004892d5
font_01_sfnt_off00008aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA4 19004 bytes
SHA-256: 2ae4233163b81a205a597c97f5f9bceef85a21038461a0399da8d1b6d9f39b0a

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