Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a0ac85cdc3ffe8…

MALICIOUS

PDF

46.2 KB Created: 2021-06-08 17:53:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fd441db36ecec0eeff3671391fe41dbc SHA-1: ddade15e079767ae41daee5ab47905bf52d2284a SHA-256: 51a0ac85cdc3ffe884458ba26491888f360e9d44e9997fc4f94a92e3f8142b1e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into downloading malicious files. It also contains numerous embedded URLs pointing to potential malware download sites, such as the one related to 'roblox-hack-top-model-game-hack'. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • 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
  • 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.tw/app/431946152/roblox-hack-top-model-game-hack
    • http://ines.co.rs/images/download-tiktok-for-free_GM835599320.pdf
    • http://ines.co.rs/images/levvvel-coin-master_GM406889139.pdf
    • http://ines.co.rs/images/free-the-alchemist-codes-roblox_GM431946152.pdf
    • http://ines.co.rs/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://ines.co.rs/images/hacks-for-coin-master_GM406889139.pdf
    • http://ines.co.rs/images/download-coin-master-apk-hack_GM406889139.pdf
    • http://ines.co.rs/images/coin-master-card-hack-apk_GM406889139.pdf
    • http://ines.co.rs/images/free-realistic-minecraft-texture-packs_GM479516143.pdf
    • http://ines.co.rs/images/www-free-robux_GM431946152.pdf
    • http://ines.co.rs/images/roblox-hack-download-pc-dungeon_GM431946152.pdf
    • http://ines.co.rs/images/roblox-free-robux_GM431946152.pdf
    • http://ines.co.rs/images/roblox-fun-robux_GM431946152.pdf
    • http://ines.co.rs/images/no-human-verification_GM431946152.pdf
    • http://ines.co.rs/images/how-to-make-a-group-on-roblox-for-free_GM431946152.pdf
    • http://ines.co.rs/images/free-robux-with-no-verification-2021_GM431946152.pdf
    • http://ines.co.rs/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://ines.co.rs/images/archery-master-3d-coins-hack_GM406889139.pdf
    • http://ines.co.rs/images/coin-master-free-spins-reddit_GM406889139.pdf
    • http://ines.co.rs/images/roblox-no-download-hack_GM431946152.pdf
    • http://ines.co.rs/images/minecraft-pe-apk-download-free-015-0_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ea3.bin
842b2d8d790f8c8cd198c31ce40dff28344412141d2d8e0bf70851b6dd7b1228		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA3 24276 bytes
font_01_sfnt_off00008662.bin
0f99604d55dac6626711b4d750768ca349af54a6e3d7fe8709188b59b2479d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8662 2876 bytes
font_02_sfnt_off0000904b.bin
5cbe0ac8995dffc8e6eb56a43a92c88785724f49fb11df8d77227de8967fd57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904B 18728 bytes

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