Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5429888f588558a…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 11:52:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: addcd2953cc10c5c9eb719c7f1dabbb1 SHA-1: d5d75509c91527d7464ea14f034c7ae7f92c8074 SHA-256: b5429888f588558a236b0fffa0f3bc1a7b0f0aba8421b3db6fe33e426157a357
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files offering 'free' game currency or items. The document body explicitly mentions 'Free Tiktok Followers No Human Verification Or Survey' and includes a URL pointing to a similar offer. This indicates a likely scam or phishing attempt designed to trick users into visiting malicious sites. While no scripts were directly extracted, the PDF structure and embedded links suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/835599320/free-tiktok-followers-no-human-verification-or-survey-game-hack
    • https://vireco.store/ckfinder/userfiles/files/how-to-take-free-robux_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/need-free-spins-for-coin-master_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/coinmasterfreespinlink_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-hack-roblox-project-pokemon_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/alone-roblox-how-to-get-free-cash_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/good-free-minecraft-server-hosting_GM479516143.pdf
    • https://vireco.store/ckfinder/userfiles/files/2021-000000-free-robux_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/mcpe-master-coins-hack_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-roblox-games-for-free_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/can-i-download-minecraft-for-free_GM479516143.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-roblox-card_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-roblox_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/freerobuxhack-us_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/2021-free-spins-on-coin-master_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/get-free-robux-pastebin_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-robux-instantly_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d8.bin
52d7a0f98d4caace04e1c4402760bde1320596d54b27fc89ec4492f1c09831b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30D8 21104 bytes
font_01_sfnt_off00005e63.bin
71a2c29614c86359ac6f9d7488c26dbde8d9137987fdabb02d1dbf8af061703e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E63 19040 bytes

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