Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b31d6c2a612171…

MALICIOUS

PDF

41.1 KB Created: 2021-05-13 05:01:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a977722856428c0fedbfcd08c067a59b SHA-1: 655610277d22c32737497b489c7c91de35969a2a SHA-256: 33b31d6c2a612171088237d1eef763a875ea354f0473a9d032d1bac6dbd62c64
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a "Robux Hack Generator" and impersonates Facebook to trick users into clicking a link. This link leads to a fake CAPTCHA page, likely intended to facilitate credential harvesting or further malicious actions. The document's structure and embedded URLs suggest it's designed to exploit user interest in in-game currency and popular platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/robux-hack-generator-game-hack.
  • 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.xyz/app/431946152/robux-hack-generator-game-hack PDF link annotation
    • https://www.nema.go.ke/images/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/robux-free-c_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://www.nema.go.ke/images/hacks-master-coin_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/robux-games_GM431946152.pdfIn PDF document text
    • https://www.nema.go.ke/images/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://www.nema.go.ke/images/coin-master-online_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004514.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4514 24700 bytes
SHA-256: 1ddebd9becfb08a62ff0695eae0b5a281868fd374b198a4b0d527281c0ea98d0
font_01_sfnt_off00007dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFC 18352 bytes
SHA-256: f5433ce3dc9930d213a8e7315569ee207b9df6dd56817c97a1fb358bc14a6a3b

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