Malicious PDF — malware analysis report

Static analysis result for SHA-256 1475e2add843481e…

MALICIOUS

PDF

44.8 KB Created: 2021-06-08 22:42:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 275a8dd7d22ce5999577612bee75be47 SHA-1: 5db1ab3dd83712f0c6bda5ff86b29edaeea4f9b9 SHA-256: 1475e2add843481eeb4b705275ab6ccf2c8e477e70daff7e648800f9d7160c17
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on suspicious domains and appear to be part of a link farm. The document also presents a fake CAPTCHA or human verification prompt to trick users into clicking these links, likely to download malicious content such as game hacks. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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/roblox-hack-ios-2021-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roebucks_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/robux-apk_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-ban_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/get-more-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-can-you-get-free-robux_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_off00005257.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5257 24772 bytes
SHA-256: 2072774671980f6a87661bf3ca82455ca45b5ff41bad0daf20b3f8e51645dd35
font_01_sfnt_off00008b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B93 18584 bytes
SHA-256: 11c0550cf9cfae25b33eaf7463d14921b147dc1a692b928185ff71b82eb4e65f

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