Malicious PDF — malware analysis report

Static analysis result for SHA-256 b378c82dfaa8b160…

MALICIOUS

PDF

48.8 KB Created: 2021-06-07 14:56:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dc7e05a196d97376229a5e68e5851afd SHA-1: 074ddad2946952b133a56b154b069589547ec0f8 SHA-256: b378c82dfaa8b16039f42822b51c58edce66b7d928cb37918fe50bc4a7309382
122 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and brand impersonation lure, specifically targeting Microsoft users, to trick them into clicking a malicious URL. The embedded URL, https://netcdn.tw/app/431946152/get-free-robux-without-verifying-game-hack, likely leads to a credential harvesting page or a download of further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 5

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/get-free-robux-without-verifying-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/get-free-robux-without-verifying-game-hack PDF link annotation
    • http://medinup.pt/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-free-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/master-coins-free_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-gift-card-codes-generator_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8F 32948 bytes
SHA-256: 3f3396f4df3ec6f1a40d8e6d2451b5715604b7dd4b47abcc323de6b2d40336cc
font_01_sfnt_off00009993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9993 19204 bytes
SHA-256: 5746df36870897246b4cc5ea976c0968428341e4eef9cabef5550fbce1302019

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