Malicious PDF — malware analysis report

Static analysis result for SHA-256 5827615cf4255d88…

MALICIOUS

PDF

50.9 KB Created: 2021-06-11 07:23:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8e835794c7e58dfe830590918d82f769 SHA-1: 3b563253a4cf3b253592dbd298c75edf63773f10 SHA-256: 5827615cf4255d8817ea596e6eb275e153bd557170d469e0c9a59524c42bde65
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as SEO-friendly links to documents related to game cheats and free currency. The document body, though heavily obfuscated, contains a URL pointing to a page about hacking Roblox. The presence of a 'download button' heuristic further suggests a lure to download potentially malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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/how-to-hack-roblox-robux-with-cheat-engine-game-hack
    • http://lib.kunci.or.id/repository/coin-master-free-spin-now_GM406889139.pdf
    • http://lib.kunci.or.id/repository/hack-coin-master-for-free_GM406889139.pdf
    • http://lib.kunci.or.id/repository/free-robux-by-watching-ads_GM431946152.pdf
    • http://lib.kunci.or.id/repository/free-spins-coin-master_GM406889139.pdf
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • http://lib.kunci.or.id/repository/toolbox-for-minecraft-pe-ios_GM479516143.pdf
    • http://lib.kunci.or.id/repository/coin-master-free-foxy-food_GM406889139.pdf
    • http://lib.kunci.or.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://lib.kunci.or.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://lib.kunci.or.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • http://lib.kunci.or.id/repository/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdf
    • http://lib.kunci.or.id/repository/coin-master-cheat-engine-hack_GM406889139.pdf
    • http://lib.kunci.or.id/repository/free-robux-everyday_GM431946152.pdf
    • http://lib.kunci.or.id/repository/how-to-actually-get-free-robux_GM431946152.pdf
    • http://lib.kunci.or.id/repository/roblox-robux-generator-no-human-verification_GM431946152.pdf
    • http://lib.kunci.or.id/repository/minecraft-free-education_GM479516143.pdf
    • http://lib.kunci.or.id/repository/coin-master-rewards-free-spins_GM406889139.pdf
    • http://lib.kunci.or.id/repository/roblox-hack-tokyo-ghoul_GM431946152.pdf
    • http://lib.kunci.or.id/repository/coin-master-hack-2021_GM406889139.pdf
    • http://lib.kunci.or.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005408.bin
df33bbfb4a875117c44aa57ec8395ffba7962bb75507b2326c8bdae4cc823501		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5408 27988 bytes
font_01_sfnt_off00009494.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9494 5596 bytes
font_02_sfnt_off0000a13c.bin
0e282403128684f0aa294ef68cd5a5652bf8ade1b2ecf8fd781872ec8e6f6240		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13C 19360 bytes

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