Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2220c1dbfca939d…

MALICIOUS

PDF

41.6 KB Created: 2021-05-13 02:36:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2070325e7f0bbe87f51ddc46708241b4 SHA-1: 55a4cd9a3077a9cb680928ecc54c7f8ba1106be9 SHA-256: f2220c1dbfca939d90fe4dc1d0c589a6f90ecfbe551c3107e5f3c13abd6fa717
90 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, including one at https://netcdn.xyz/app/431946152/robux-robux-game-hack, which is associated with a brand-impersonation credential phishing lure. The document also uses urgency language and visual download cues to encourage user interaction. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of a malicious payload or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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/robux-robux-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/robux-robux-game-hack PDF link annotation
    • http://kcpb51.ru/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://kcpb51.ru/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/get-free-spins-on-coin-master_GM406889139.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_off000048cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48CD 24916 bytes
SHA-256: bc7f444cdcf467c5a7b3de7614251ee9a8a115396aa8a0cc1ec20fe25d7517cc
font_01_sfnt_off0000819f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819F 17852 bytes
SHA-256: fa3705be5ee6565d64fcba6f9827690fa2c8bb031b8e73c4196ce8f5ba2d7c1a

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