Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e62a9676e3882b…

MALICIOUS

PDF

45.3 KB Created: 2021-05-19 18:43:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 67eebfcfaa62cd8a4ad65172fe58f8ed SHA-1: 52e0a15fcaddda55d82c6255699c6171195485f0 SHA-256: f3e62a9676e3882b26c4e6c7a1076143033d82612cba7dfd5a8ea744e62b7a0b
82 Risk Score

Malware Insights

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

The PDF document contains a lure impersonating Facebook to trick users into clicking a link for 'free Robux', which leads to a credential phishing site. The ML classifier strongly flagged this PDF as malicious, and the embedded URI points to a known malicious domain. While no scripts were extracted, the document's structure and embedded links suggest it's designed to exploit user interest in in-game currency or virtual items to steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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: https://netcdn.xyz/app/431946152/free-robux-come-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/free-robux-come-game-hack PDF link annotation
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000494b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x494B 25144 bytes
SHA-256: 1cecff80fe0a35e7e49639ba0a67a973fdf8ea60d1ac753bb6e32edd21546436
font_01_sfnt_off00008397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8397 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC1 18276 bytes
SHA-256: d7491fe45cc88596c87233a963b6162720bf27c142cea717df16fbc09fa29ea6

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