Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fbfff4e1c9449d…

MALICIOUS

PDF

45.3 KB Created: 2021-05-15 13:00:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 625cddc79f503cfddfd1cfbc4b9be94d SHA-1: c4ad9b4687cd62d755d4d87488ee9fc21fe80472 SHA-256: b0fbfff4e1c9449da0f485ab0a63eb879c648de2cc0b83e83da18302670641c9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to attract users searching for game cheats or free in-game currency. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and the ML classifier flagging the PDF as malicious strongly indicate a malicious intent. The document body and extracted URLs suggest a lure for free spins and hacks for games like Coin Master and Roblox, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/daily-free-spins-coin-master-game-hack PDF link annotation
    • http://s-punkt-objects.de/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://s-punkt-objects.de/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/archery-master-3d-coins-hack_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_003_off00004a8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8B 24160 bytes
SHA-256: 0052689a43d80f8197ea2780fe16f52e29fd055aa79d987173e7bbd0cc694e37
font_01_sfnt_off00008127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8127 3724 bytes
SHA-256: 1dbf92c8ade2c45a56b7c0b86f1a9aff744e4b3cba54180f762326c3b4f8c0be
font_02_sfnt_off00008e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4A 18308 bytes
SHA-256: 814bd0a2b88bdef89f3245e401f7fc464bd7314e61fe604409dcfddce4500050

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