Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdb26fcbf3b75a1…

MALICIOUS

PDF

43.7 KB Created: 2021-04-30 09:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e250ee4a75fe7bafbf8a084a0dbe242c SHA-1: 1698a17260d2a3589bfaae4a0f4d086f5a14b3c5 SHA-256: 1cdb26fcbf3b75a142d4c3110a413da69e6a42db9379330c7546780ad03b209c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure impersonating PayPal and promising free Roblox items, directing users to a malicious URL. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple embedded URLs further supports a phishing or malware distribution attempt. The document body text and heuristics indicate a credential phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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/roblox-people-getting-passes-for-free-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/roblox-people-getting-passes-for-free-game-hack PDF link annotation
    • http://technibuild-group.com/uploaded_files/userfiles/files/fast-robux-hack.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/free-robux-generator-website.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/robux-hack-website-no-survey.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021-payed.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-hacks-hack-de-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-promo-codes-november-2021.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/free-to-use-roblox-ads.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/robux-cheat-codes-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/batu-free-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-minecraft-game-free.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_003_off000043dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43DC 29028 bytes
SHA-256: 682de43a76608024c4975dc7c9d912453ef4a6f9906cd5c7979a4510af84f596
font_01_sfnt_off00008730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8730 19016 bytes
SHA-256: fed4ea8176decd277c9c8e45b6c7e115fa9e2ec8228c6be48c631f1c781650c3

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