Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19348bd56edc1f9…

MALICIOUS

PDF

45.6 KB Created: 2021-05-17 00:00:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e06cc472c8b05479dd7b196119d423ea SHA-1: 530eb160e4b796817f9062954ffd431d24c9aabf SHA-256: e19348bd56edc1f944731ddd1f19a267c25f8abea25a877c69e5a51aa0be9c78
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a malicious lure, presenting a fake CAPTCHA to trick users into interacting with external links. The presence of a large number of external links, many pointing to 'free spin' or 'free robux' related content, suggests a link farm or phishing operation. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-spin-coin-master-2021-game-hack
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/daily-free-spin-link-in-coin-master_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/coin-master-mod-version-free-download-v344_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/roblox-promo-codes-free-robux_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/getrobux-now_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/free-robux-hack-no-verification_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/hack-coin-master-pc_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/free-roblox-app_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/get-me-free-robux_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/master-coin-master-free-spin_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/free-roblox-hair-girl_GM431946152.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/coin-master-free-spin-today_GM406889139.pdf
    • https://elearning.mtsnkarimun.sch.id/__statics/gudangsoal/files/coinmaster-free-spins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d0b.bin
cfe4bc2f1ed984c53c571dbc535f5083956a236b1841729a1dfd589e64e60e6a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D0B 24852 bytes
font_01_sfnt_off000085c7.bin
381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C7 2824 bytes
font_02_sfnt_off00008f6a.bin
fd0044dd07fea29fabb02cccaad095bc879ba68536b4dede47c40461e88c70e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 18288 bytes

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