Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c457fd264ab968e…

MALICIOUS

PDF

33.4 KB Created: 2021-06-21 00:47:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: efadbf11f35bb2866be17b34cada569c SHA-1: 271bd3b53d1d932b4fc21bebba6b6e457dd587ea SHA-256: 4c457fd264ab968ea5801249336a66a8a34279175090e437f6edf8b668f3f37e
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document body and extracted URLs indicate a lure for free in-game currency (Robux, Coin Master spins) which is a common phishing tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests it is designed to redirect users to download further malicious content. No scripts were extracted from this sample, but the overall pattern suggests a phishing attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/bux-free-robux-game-hack PDF link annotation
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/robux-scam_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/easy-points-gg_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/get-robux-now_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F54 21460 bytes
SHA-256: 130c6bb522c8148761907785224fdc582a2ff86bf4fcdb97cc8b140e89a86836
font_01_sfnt_off00005e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E32 18716 bytes
SHA-256: 387288f024d8c8f54f23c256e97e071e9b3801b919dc08d0a5cbca9b70f610f0

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