Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ed010cafe3c45a…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 22:43:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d1f1627fbd4d135e29f8931d97e7b592 SHA-1: cd19469af2b0b505358a589f37f69118da5112a7 SHA-256: 21ed010cafe3c45a2db02fbde9ff12faf1c36000db473d38349baa92a5da6c03
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to game-related hacks and freebies. The document body and embedded URLs suggest a lure for users seeking in-game advantages, likely leading to malicious downloads or phishing. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm designed to distribute malware or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/get-2021-free-spins-on-coin-master-game-hack
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/toolbox-for-minecraft-pe-ios_GM479516143.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-hack-apk-app_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-level-3_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-daily-free-link_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/get-free-robux-today_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-free-spins--coins-2021_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-obby-2021_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/www-roblox-com-free-robux_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/get-free-minecraft-account_GM479516143.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-minecraft-account-and-password_GM479516143.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/roblox-lawsuit_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-without-human-verification_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/no-human-verification-hack-for-coin-master_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/microsoft-roblox_GM431946152.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-game-hack-app_GM406889139.pdf
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-email-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d13.bin
5d1b74c9050b64eff5ab41b9feece4a5402b0692c3e9a52a0752c8268d3fb840		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D13 24080 bytes
font_01_sfnt_off000083fe.bin
882c1e08e977239ecedb915e199b33d6770e962ab42e0389920a883bc9e88219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FE 18288 bytes

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