Malicious PDF — malware analysis report

Static analysis result for SHA-256 637adebb948b3531…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 14:02:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fc20bc837d870058c2ae7be5460f9a2d SHA-1: 55826af78978f52808e2c23c8beae40c2d605767 SHA-256: 637adebb948b353115cae3b13106afdc5a3918e1b68ca41a90f30952b8796ace
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering game cheats and hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a malicious intent to drive traffic to potentially harmful sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the embedded URLs and the nature of the content strongly suggest a phishing or malware distribution attempt.

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/free-spins-coin-master-october-17-2021-game-hack
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/coin-master-hack-online-cheat_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-robux-with-no-survey_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-unlimited-coins-for-coin-master_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/give-me-robux-now_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/coin-master-hack-version-2021-free-download_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/codes-to-get-free-robux_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/minecraft-items_GM479516143.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/coin-free-spin_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/can-i-get-robux-for-free_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-roblox_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/hack-coin-master-spin-android_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/robux-without-verification_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/minecraft-116-1-download_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cbc.bin
98a7725da4468e8760a6b61c19a6ee2631d1d096c5ada2bee5c118bd5b47ba75		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CBC 24796 bytes
font_01_sfnt_off000083d8.bin
aa7bff32dbd331c78ef5965829602ae5e6111fcf7e9748869226dce5f8ff9ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D8 18504 bytes

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