Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bdf9efd5ac4a35…

MALICIOUS

PDF

50.6 KB Created: 2021-05-12 12:44:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e76f7012555004a47ad07a8106398380 SHA-1: dead763f21ca9aba3b55a01c020247abfe476c8e SHA-256: b1bdf9efd5ac4a352a1e15b937b3cb23290e76633819a623ee4c7c65e100d568
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files related to game cheats and currency. The presence of a direct download URL and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'dailyrobux' and game-related terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/431946152/dailyrobux-game-hack
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/how-do-u-hack-roblox_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/100-free-spins-coin-master_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/best-minecraft-hacks_GM479516143.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-verification_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-free-coin-and-spin-app_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-robux-sites-that-work_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master-game_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/download-coin-master-apk-hacked_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-gift-hack_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/roblox-group-free-robux_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/pig-master-free-spins-and-coins_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/minecraft-marketplace-free_GM479516143.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/coin-master-coins-hack_GM406889139.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/roblox-skin-free_GM431946152.pdf
    • https://www.elearning.ma-alqasimiyah.sch.id/__statics/gudangsoal/files/hack-coin-master-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d7d.bin
601c4245fea6d5ffe3be933f2604b9179b458487c5b85a96d4c5b3afcbed1ed0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D7D 38412 bytes
font_01_sfnt_off0000a2e6.bin
006376ad9c7b73d4fd15d3b6dd3ffa9064f0af8ff6d6cdc29d45d1e9c8c3f0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E6 18620 bytes

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