Malicious PDF — malware analysis report

Static analysis result for SHA-256 169f5582479e6cc3…

MALICIOUS

PDF

48.6 KB Created: 2021-06-11 12:25:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 832c454f5574983e4a122203ce7f0c49 SHA-1: 2b065489623f36d0b98caee694c43948ecea9b18 SHA-256: 169f5582479e6cc3430c14b1823807f73d418a054ec0d28939e13681e83f1c43
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous embedded URLs and a document body that promotes free in-game currency for popular games, acting as a lure. The ML classifier flagged this PDF as malicious with a high probability. The presence of external URIs and the overall context suggest the document is designed to trick users into downloading a second-stage payload, likely containing JavaScript, which could then exploit vulnerabilities or lead to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/javascript-roblox-robux-hack-game-hack
    • https://www.fubode.org/images/free-robux-pastebin-code_GM431946152.pdf
    • https://www.fubode.org/images/the-coin-master-hack_GM406889139.pdf
    • https://www.fubode.org/images/free-spin-link-for-coin-master_GM406889139.pdf
    • https://www.fubode.org/images/minecraft-pc-free_GM479516143.pdf
    • https://www.fubode.org/images/monkey-free-robux_GM431946152.pdf
    • https://www.fubode.org/images/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • https://www.fubode.org/images/free-robux-codes-2021-not-used_GM431946152.pdf
    • https://www.fubode.org/images/free-robux-com-no-verification_GM431946152.pdf
    • https://www.fubode.org/images/coin-master-32-hack-apk-download_GM406889139.pdf
    • https://www.fubode.org/images/free-spin-in-coin-master_GM406889139.pdf
    • https://www.fubode.org/images/free-roblox-hack_GM431946152.pdf
    • https://www.fubode.org/images/free-tiktok-followers-generator-no-human-verification_GM835599320.pdf
    • https://www.fubode.org/images/coin-master-free-spins-coins_GM406889139.pdf
    • https://www.fubode.org/images/roblox-bad-business-hacks_GM431946152.pdf
    • https://www.fubode.org/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdf
    • https://www.fubode.org/images/free-spin-link-coin-master_GM406889139.pdf
    • https://www.fubode.org/images/free-robux-survey_GM431946152.pdf
    • https://www.fubode.org/images/add-robux_GM431946152.pdf
    • https://www.fubode.org/images/huskybuscom-free-robux_GM431946152.pdf
    • https://www.fubode.org/images/how-to-get-hacks-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052c8.bin
16c1dab44e104be1137b1ecc8ba22625eb221580bb9e41e56c14d2fffa3b4fe9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C8 25924 bytes
font_01_sfnt_off00008edf.bin
4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDF 2816 bytes
font_02_sfnt_off000098f0.bin
2e1a100b5a450f503d9c90cda90060502d8b991bd55538d7c2cd53149cd676cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x98F0 19004 bytes