Malicious PDF — malware analysis report

Static analysis result for SHA-256 72411d2a772cdfc4…

MALICIOUS

PDF

45.4 KB Created: 2021-06-10 17:46:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 221f388589aebe89981b4c65e2b01380 SHA-1: 38cc436aace3e54fbb3864669a935a82a1a4245e SHA-256: 72411d2a772cdfc49c11a330b297f3ed3c16a1df544237d1c69febad0ea1c0f9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are part of a link farm designed to mimic search engine results for game-related cheats and currency. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent to redirect users to potentially harmful sites. The document's content and structure suggest it's a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-free-robux-join-group-game-hack
    • http://digilib.stimlog.ac.id/repository/how-to-get-unlimited-robux-2021_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/how-to-get-robux-easy_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/free-robux-no-verification_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/minecraft-hack-ios_GM479516143.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-hack-a-roblox-account-quick_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spin-software_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-spin_GM406889139.pdf
    • http://digilib.stimlog.ac.id/repository/free-spins-on-coin-master-iphone_GM406889139.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spin-group_GM406889139.pdf
    • http://digilib.stimlog.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-new-link-free-spin_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/coin-master-hack_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-hack-on-laptop_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-rewards_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/minecraft-alt-accounts-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005234.bin
a7531667549bf18e8fa680f82ed5aefd69dbb3352144df8c7e985b08cea40115		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5234 26256 bytes
font_01_sfnt_off00008e62.bin
ade2b191e06f84f277229b31aaac4e548a76d4c23e2119899bda1f48d6f6f3da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E62 18548 bytes

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