Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0f2a83cd739346…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 09:53:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b1dd793f223895410de3195691d43208 SHA-1: cc7ceef2189675c88dce25defbc061022aba096e SHA-256: 2f0f2a83cd7393465416ac345bcfa66d35d67e1eaab1c13950ec0c85448bc2ed
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA and a call-to-action to trick users into clicking a link for a "free Robux generator". The embedded URL, https://netcdn.tw/app/431946152/hack-robux-free-generator-game-hack, likely leads to a malicious download or phishing page. The document's structure and content strongly suggest a social engineering attack aimed at tricking users into executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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/hack-robux-free-generator-game-hack PDF link annotation
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/black-pants-roblox-free_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-download-roblox-intros_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-free-giveaway-obby_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/hack-someone-roblox-for-free-robux_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-level-7-executor-free_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-hack-fly-download_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/jeux-de-hacking-sur-roblox_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-actually-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/bypass-roblox-chat-filter-hack_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-how-to-get-free-robux-september-2021_GM431946152.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-hack-robux-android-1_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_off00005309.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5309 24176 bytes
SHA-256: 67172fc5107edb0c4b07391e2e30645a7684512c9ffb047b13578c1bef7e12b3
font_01_sfnt_off00008a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A73 18516 bytes
SHA-256: da3ee04730792cfa79f12b3d2b10263437179e50bed719591cac0b54b00d23f9

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