Malicious PDF — malware analysis report

Static analysis result for SHA-256 e490c0ca6b09f9d0…

MALICIOUS

PDF

33.1 KB Created: 2021-06-28 23:16:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b818c73fb3195750e8e8d4b138afe58b SHA-1: f93132227e4835ffae4871f5ea7b0d948ec77a77 SHA-256: e490c0ca6b09f9d0a43e7c95a6394c48386b7f72ba6026c3affd7e795e70e282
82 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and a call-to-action phrase, impersonating the Roblox brand to lure users into downloading a malicious file. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs point to potentially harmful content. While no scripts were extracted, the document's structure and content suggest it's designed to trick users into executing a secondary payload, likely through a downloaded file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/roblox-exploit-2021-cheat-engine-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.co/app/431946152/roblox-exploit-2021-cheat-engine-game-hack PDF link annotation
    • http://pustaka.fti.unand.ac.id//repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/abstract-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-generator-no-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/secret-free-roblox-hats-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/bux-gg-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-robux-2021-november_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-cheat-engine-download_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/tuto-hack-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/fondo-roblox-hacker_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_off00002af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF4 21872 bytes
SHA-256: b5b0f2f72e73b1f2af2e2053f8c5bbfe7e92b0a5d60eab8329f33614b692da22
font_01_sfnt_off00005b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B63 19456 bytes
SHA-256: 4d5e65b57282cb6c33fe7b071fc5e7550ede1290b5d5206780349c9f122c4531

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