Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b3381959b25056…

MALICIOUS

PDF

44.5 KB Created: 2021-06-11 03:44:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bb9d7a06aa812532f13fd77c63c43919 SHA-1: 67149e236f293215c3a37d71457106fa796734d5 SHA-256: f3b3381959b250567c2eb69c1bc4630ada83ef27796501ec3e0550a36725b567
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA or human verification prompt, a common lure to trick users into interacting with malicious content. It also embeds a URL pointing to a resource related to 'roblox hack', suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-hack-peoples-account-game-hack PDF link annotation
    • https://uofk.edu/images/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/gift-card-codes-roblox-free_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/cheat-engine-63-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/coinmaster-links_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/any-cheats-for-tycoon-roblox-games_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/how-to-get-free-robux-in-roblox-pc-2021_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_off00005109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5109 24636 bytes
SHA-256: 3da6883e482379d02762de52e54e7a534daa5d6e75370eed3d3ae557da06b40d
font_01_sfnt_off000089a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A9 18756 bytes
SHA-256: 365c3ffce2c0af5dfc73dc78283269ce9bcfc435baf3b3e28a89f351e88fa7f7

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