Malicious PDF — malware analysis report

Static analysis result for SHA-256 9221a31f0e6fb70f…

MALICIOUS

PDF

43.2 KB Created: 2021-05-12 13:46:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9e11e76a9d29acb4d3c4324cc802cc8f SHA-1: 72e67ac1969b18e6dc5f7ef38cfc0b468eb3d802 SHA-256: 9221a31f0e6fb70f68e09f6e6aca26a05c5a62bf4faff0317c09af33a41948df
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external PDF files, suggesting a link farm or SEO spamming operation. The primary URL, https://netcdn.xyz/app/406889139/free-spins-coin-master-2021-hack-game-hack, is likely a lure for a scam. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/free-spins-coin-master-2021-hack-game-hack PDF link annotation
    • http://astdubai.co/userfiles/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-link_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-with-no-human-verification_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_003_off00004b1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1C 25732 bytes
SHA-256: fab1afcc2b0a737c971c8876c84c6e005d16b6418312335ddd5e9758710b3b50
font_01_sfnt_off0000860a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860A 18456 bytes
SHA-256: a5560883dc18b22b6e1d4164516743640258d4849b8ee5f58e623da8a68570df

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