Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f50a320b81d77d…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 17:57:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: acc6cfc1b2d03811514195904e1e3cc2 SHA-1: 2df4e1ef160b900aedba23083a787639a6b8b387 SHA-256: d2f50a320b81d77d186f8cfc46cf9dc16d19d48ae5d6132d14fc7c5c833fd6dc
82 Risk Score

Malware Insights

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

The PDF document contains a lure related to "Roblox Hacks 2021" and impersonates the Facebook brand, directing users to download a file from a suspicious URL. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates a potential download or redirection to a second-stage payload. No scripts were extracted, but the overall structure suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/roblox-hacks-2021-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.online/app/431946152/roblox-hacks-2021-game-hack PDF link annotation
    • http://www.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://www.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.denpasarkota.go.id/new/public/ckfinder/userfiles/files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://www.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.denpasarkota.go.id/new/public/ckfinder/userfiles/files/113-hacked-client_GM479516143.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
stream_004_off000050c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C9 26036 bytes
SHA-256: 452f53e4a92c67548235d989b5caf431776e74e979e4221bf956ca5f027e830c
font_01_sfnt_off00008c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C24 18584 bytes
SHA-256: 09e382df304bf090e7d4979f9a4a25aa7e11969d647bdc760e706e621b680adc

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