Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6770b4f8fb29e1e…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 03:42:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e7c076547be53b9e7ae95bf6b7215a5e SHA-1: ddae89561f17ed18f49ab3f5cbfdfe80add97ee6 SHA-256: e6770b4f8fb29e1e80385100ac120dbf4bc63221452272379ef8b67838e6f68c
82 Risk Score

Malware Insights

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

The sample is a PDF document that impersonates PayPal to trick users into clicking a malicious link. The link leads to a download for a "free script runner" for Roblox, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a call-to-action button further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-script-runner-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/free-script-runner-roblox-game-hack PDF link annotation
    • http://eurosystemssrl.it/images/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-to-hack-into-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/cheat-engine-roblox-2021-robux_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-cute-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://eurosystemssrl.it/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://eurosystemssrl.it/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://eurosystemssrl.it/images/robux-hack-no-verification_GM431946152.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_off00004f25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F25 27868 bytes
SHA-256: c65c97bc33adf4d4c525bd188d66f598909993edfc92b8d5d53373dfe7bf2015
font_01_sfnt_off00008dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEC 18488 bytes
SHA-256: bd5861fe5290ebbd45510ce57b7cca0800a923c6467bda630e1087453b34d97c

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