Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e55a1be71a7fb4d…

MALICIOUS

PDF

46.6 KB Created: 2021-06-13 16:21:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: de6fa9ecd30ca203e2b83cd4a91825b0 SHA-1: 3f8dfd6dabd5806631c91df6ae3c90e37782250d SHA-256: 1e55a1be71a7fb4d0b8b4d35532ec24065be024e85a65423d7b22739b32a7c0d
122 Risk Score

Malware Insights

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

The PDF document contains multiple invisible and visible links that lure users with the promise of free Robux, a virtual currency for the Roblox game. These links, such as 'http://netcdn.co/app/431946152/how-do-you-get-free-robux-on-roblox-android-game-hack', likely lead to malicious websites designed to exploit users or deliver further malware. The ML classifier strongly indicated maliciousness, and the presence of CAPTCHA-themed lures suggests a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://netcdn.co/app/431946152/how-do-you-get-free-robux-on-roblox-android-game-hack
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/get-free-robux_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-hack-roblox-so-you-can-get-robucks_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-dell-laptop-roblox_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/roblox-free-online-play-as-guest_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/robux-hack-no-survey-no-download_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-promo-codes-2021_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/legit-free-robux-2021_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-hack-someone-roblox-2021_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/www-mistplay-com-how-to-get-free-robux_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-generator-no-survey-or-captcha_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/roblox-hack-2021-free-robux-generator_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-generator-robuxian_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-scams_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/hacks-para-roblox-inparcheable_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/minecraft-free-download-iphone_GM479516143.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/create-minecraft-server-free_GM479516143.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/wwwget-free-robloxcom_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-account-passwords-roblox_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-change-roblox-game-name-with-hacks_GM431946152.pdf
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/hack-accounts-roblox-2021_GM431946152.pdf
    • https://www.awwda.go.ke/
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005708.bin
3b7fa72a208624b601cff5453f4b3581b590b9d3ad32835ed6d581f03b8a2cde		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5708 25956 bytes
font_01_sfnt_off000091b5.bin
cb707a3c7f254af59997cc884afe0433877952110dc074552e6e6d7d9f1d6759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B5 18980 bytes

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