Malicious PDF — malware analysis report

Static analysis result for SHA-256 554a131d261c2521…

MALICIOUS

PDF

45.7 KB Created: 2021-05-15 06:06:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5f053fe70bbdb5cbe0cd2c8c5022c141 SHA-1: 8a3d6fe14ef04a5c3aa37960ae01840bd975d883 SHA-256: 554a131d261c25218f9f101175bc59a71432fcc9cf666024b2ed740c03488d8c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document displays a fake CAPTCHA to trick users into clicking a link, which is a common social engineering tactic. The primary external URI points to a site offering 'free Robux', suggesting a scam or phishing attempt. While no scripts were directly extracted, the PDF structure and heuristics indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-no-verify-game-hack
    • https://www.zagi.hr/files/the-coin-master-hack_GM406889139.pdf
    • http://zagi.hr/files/best-free-spin-app-for-coin-master_GM406889139.pdf
    • https://www.zagi.hr/files/links-to-get-free-coins-in-coin-master_GM406889139.pdf
    • https://www.zagi.hr/files/easy-how-to-get-free-robux_GM431946152.pdf
    • https://www.zagi.hr/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdf
    • http://zagi.hr/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • https://www.zagi.hr/files/free-roblox-gift-card-codes-2021_GM431946152.pdf
    • https://www.zagi.hr/files/hacks-to-get-free-robux_GM431946152.pdf
    • http://zagi.hr/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdf
    • https://www.zagi.hr/files/robux-for-surveys_GM431946152.pdf
    • https://www.zagi.hr/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://www.zagi.hr/files/is-minecraft-free-on-switch_GM479516143.pdf
    • http://zagi.hr/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://www.zagi.hr/files/coin-master-latest-mod-apk-free-download_GM406889139.pdf
    • https://www.zagi.hr/files/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://zagi.hr/files/master-free-spin-and-coin-link_GM406889139.pdf
    • http://zagi.hr/files/free-robux-2021_GM431946152.pdf
    • https://www.zagi.hr/files/roblox-free-vip-server_GM431946152.pdf
    • https://www.zagi.hr/files/how-to-use-wurst_GM479516143.pdf
    • http://zagi.hr/files/free-spin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004649.bin
4a7d401391669d4719c7f5ca31bedbfc09d8790c2e9e0a0892a6decc849542ee		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4649 27500 bytes
font_01_sfnt_off000085b6.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B6 2824 bytes
font_02_sfnt_off00008f64.bin
c82a2e535d1b02ce633786be567827726fc21df48f71ae9cb05a1d9866072f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F64 18448 bytes

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