Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a9a2954864c234…

MALICIOUS

PDF

47.7 KB Created: 2021-06-10 19:04:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8984f475bf4906a53e68f18f52edadff SHA-1: c920661327d5c48b3ae8c22d1ba80a6311010454 SHA-256: d9a9a2954864c2343267c142adc3f056c8d70f55d6933b40a12a42dbb1afcc0f
122 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 Roblox in-game currency. The primary link, https://netcdn.tw/app/431946152/how-to-get-bloxburg-for-free-on-roblox-game-hack, is hosted on a domain unrelated to the impersonated brand, indicating a phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/how-to-get-bloxburg-for-free-on-roblox-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.tw/app/431946152/how-to-get-bloxburg-for-free-on-roblox-game-hack PDF link annotation
    • https://www.e-library.smpn09.semarangkota.go.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-robux-just-join-group_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/blood-and-iron-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/gods-of-elements-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/lua-scripting-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-funny-roblox-shirt_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/all-free-things-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/how-to-get-free-outrageous-builders-club-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/how-do-u-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/hack-card-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/free-online-roblox-star-wars-games_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/hacking-websites-for-robux_GM431946152.pdfIn PDF document text
    • https://www.e-library.smpn09.semarangkota.go.id/repository/jai-eu-2021000-free-robux-no-fake-2021_GM431946152.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
stream_004_off00005415.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5415 24696 bytes
SHA-256: 3361ee0d4ae52ce5ce0115c79849dd17a7a706dcef167e0a9728ad3d297e5518
font_01_sfnt_off00008ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA0 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000964f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x964F 18644 bytes
SHA-256: d85572b84104e0082ac5b8a2e80c3b1374116240f7658dc62b709559c429fdd8

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