Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b44a7138192d70…

MALICIOUS

PDF

34.7 KB Created: 2021-07-22 00:55:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dcd68063334999e7a4c91adf3e603bb7 SHA-1: 8c5728a96d4486d74963077bd693624550f98dd1 SHA-256: d8b44a7138192d7081bcf3e52c1ac4e77b776ea1a66ce867680713210e1d89d7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a lure for free Robux, impersonating Facebook and directing users to a malicious URL. The ML classifier strongly flagged this PDF as malicious. The embedded URL `http://netcdn.tw/app/431946152/how-to-get-free-robux-without-human-verification-game-hack` is likely used to deliver a second-stage payload or conduct credential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 4

  • 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: http://netcdn.tw/app/431946152/how-to-get-free-robux-without-human-verification-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 http://netcdn.tw/app/431946152/how-to-get-free-robux-without-human-verification-game-hack PDF link annotation
    • https://www.yogaschooldecypres.be/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.yogaschooldecypres.be/images/robux-gift-card-free_GM431946152.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
font_00_sfnt_off00002d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D8D 23156 bytes
SHA-256: 81968b08a507e5b829e628a798f7bbb04f7b999e9b1779331e00a0ddf2a5b4d4
font_01_sfnt_off000061e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 19576 bytes
SHA-256: d6c196fa7de21508bf6b3e678e512c9fb9da877bdd87245515b69efbbf320e55

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