Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a4158d6221b1cf…

MALICIOUS

PDF

46.5 KB Created: 2021-05-19 18:52:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a71dc469c0369033f8a46faa5e427fdc SHA-1: 5714e34f401c4796c93ae5c2cf9203a533431dc1 SHA-256: 45a4158d6221b1cf50e789b7ee04b828147a70c5b1335e30303cc9237e431627
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized links for game-related hacks and free items. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate malicious intent. The document body, though heavily obfuscated, contains URLs that likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/coin-master-time-hack-game-hack
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/bux-free-robux_GM431946152.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/free-bling-bling-card-coin-master_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-hacks-for-android_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/microsoft-rewards-robux_GM431946152.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/free-robux-pin-codes_GM431946152.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-download_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/minecraft-hack-app_GM479516143.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/how-can-i-get-free-robux_GM431946152.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/legit-coin-master-hack_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/pubg-uc-full-form_GM1330123889.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/does-coin-master-hack-work_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/how-to-hack-pubg-uc_GM1330123889.pdf
    • http://elearning.man1kotamobagu.sch.id/__statics/gudangsoal/files/coin-master-cheat-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000485d.bin
ddaf0175d1dfe8693ef3401ab0dd14fe5565f9566c8e16d91f26016b8604bc8a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485D 27660 bytes
font_01_sfnt_off0000865f.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865F 2840 bytes
font_02_sfnt_off00009011.bin
273d2e5d729dd2c876f10f4fb85390cf0214890ed0d4aa342e9575e0eb4abf90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9011 19304 bytes

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