Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83df8dd215c65bb…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 05:39:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 892bc7b3ab63a13e13c8cc2ddb70908f SHA-1: 26afa69ef6681db90e97e128c4264a55da9a904a SHA-256: a83df8dd215c65bbc0ca5298f910415b4777266ad494b988ef30faf4a0e665ab
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action to trick users into clicking a link, likely to download a secondary payload or phish for credentials. The embedded URL points to a site offering 'free Robux', a common lure for malicious content. While no scripts were directly extracted, the ML classifier and fake CAPTCHA heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/how-to-get-free-robux-with-no-verification-game-hack
    • https://www.ashkarco.com/uploaded_files/userfiles/files/hack-pokemon-go-free-coins_GM1094591345.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/www-roblox-com-free-robux_GM431946152.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/is-uc-pubg_GM1330123889.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/rbx-place-free-robux_GM431946152.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/coin-master-hacks-no-surveys_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-robux-co_GM431946152.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/coin-master-heaven-links-free-spins_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/hack-coin-master-xyz_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/roblox-free-vip-server_GM431946152.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/wurst-115-2_GM479516143.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-roblox-accounts-dantdm_GM431946152.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-coin-master-s_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-role-in-coin-master_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/moon-active_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/roblox-com-hack_GM431946152.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdf
    • https://www.ashkarco.com/uploaded_files/userfiles/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005082.bin
01423f6b590f34e2b245158b01b5dda1aa1521261af50a13c54dead6853b5fb9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5082 24920 bytes
font_01_sfnt_off00008a17.bin
acb72b37f9b0a7ac0fa23716fb81d4af9379ab539551c05381b29cd372bdbe33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A17 19128 bytes

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