Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc73861b304d7390…

MALICIOUS

PDF

45.1 KB Created: 2021-05-16 01:15:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 769af7a0b2b26f1e99e86adaeb05e028 SHA-1: d6f4c6446e6c30b1b214b6ff5d48983d3f98a7c3 SHA-256: bc73861b304d73906c33ae039ecef1a42af1692780a6a45dc3ed359e5d3a019e
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or verification prompt to trick users into clicking a link, likely to download a second-stage payload or lead them to a scam website. The embedded URL https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-verifying-game-hack is directly associated with the lure. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-get-free-robux-without-verifying-game-hack
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/moonactive-coin-master-free-spins_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/get-free-spins-coin-master_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/roblox-trolling_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/coin-master-free-spins-ios-2021_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/roblox-hack-download-pc_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-april_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-robux-by-watching-ads_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-robux-no-verification-2021_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-robux-no-verify-2021_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-spins-coin-master-daily_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/is-free-robux-real_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-roblox-outfits_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-headless-head-roblox_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/minecraft-multiplayer-free_GM479516143.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-minecraft-gift-codes_GM479516143.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/krnl-download_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c38.bin
9d7b4181de395fed568bcf4d95fdcb375656750da76d1dac59a6d2b41ecae29e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C38 27340 bytes
font_01_sfnt_off00008ac6.bin
63de63cfc252acdf530e8b3b2390dbc20d855d9653817057ed506b48c41b68ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC6 19368 bytes

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