Malicious PDF — malware analysis report

Static analysis result for SHA-256 045b3f3bb9491d3a…

MALICIOUS

PDF

41.9 KB Created: 2021-05-19 07:22:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 572b5b6f1c10206611bef661fa4b1d76 SHA-1: 51c92ba38b1b15b705271e6a41543b4d02df9682 SHA-256: 045b3f3bb9491d3a8c4815b8c1c810cc2683aa9474de6549fef50ca13e9376e6
62 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a visual "download button" lure, strongly suggesting an attempt to trick the user into downloading further malicious content. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains references to game hacks and free spins, aligning with common social engineering lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/coin-master-free-spin-27-game-hack
    • http://cosver.eu/images/daily-free-spins-for-coin-master_GM406889139.pdf
    • http://cosver.eu/images/free-robux-accounts_GM431946152.pdf
    • http://cosver.eu/images/150-free-spins-coin-master_GM406889139.pdf
    • http://cosver.eu/images/minecraft-education-edition-free_GM479516143.pdf
    • http://cosver.eu/images/robux-free-co_GM431946152.pdf
    • http://cosver.eu/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://cosver.eu/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • http://cosver.eu/images/minecraft-free-online-games_GM479516143.pdf
    • http://cosver.eu/images/getrobux-ninja_GM431946152.pdf
    • http://cosver.eu/images/minecraft-free-play-no-download_GM479516143.pdf
    • http://cosver.eu/images/roblox-free-robux_GM431946152.pdf
    • http://cosver.eu/images/free-robux-only-1-step_GM431946152.pdf
    • http://cosver.eu/images/jailbreak-roblox-hack_GM431946152.pdf
    • http://cosver.eu/images/real-robux-generator-2021_GM431946152.pdf
    • http://cosver.eu/images/free-spin-and-coin_GM406889139.pdf
    • http://cosver.eu/images/app-master_GM406889139.pdf
    • http://cosver.eu/images/real-free-robux-codes_GM431946152.pdf
    • http://cosver.eu/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://cosver.eu/images/coin-master-hack-app-download-free_GM406889139.pdf
    • http://cosver.eu/images/coin-master-70-spin-link-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004662.bin
38e273ef14ecc05b29431d7bd06a9753374cd4c8ccb17a85d53df2b77df3cad3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4662 26072 bytes
font_01_sfnt_off0000821c.bin
e5d4af430e647cf7cb0e22ed46cbaed1bc4db951ce3e04e592ed76e802cdb32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821C 18064 bytes

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