Malicious PDF — malware analysis report

Static analysis result for SHA-256 911bcae52e898a13…

MALICIOUS

PDF

46.3 KB Created: 2021-06-04 03:32:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: abb0708c09132195e6f501c228e2408b SHA-1: 596156b7edef7a8d3a235be66bc2cc4cceb59ca6 SHA-256: 911bcae52e898a1315885b9f3f6e878a395d3f7d955b5b124c36cb90cd2348b1
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also features a large number of external links, many of which are SEO-optimized and point to gaming-related hacks or cheats, suggesting a scam or malware distribution campaign. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/how-to-earn-robux-by-playing-games-game-hack
    • http://library.darmaagung.ac.id/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdf
    • http://library.darmaagung.ac.id//repository/aimbot-download-roblox_GM431946152.pdf
    • http://library.darmaagung.ac.id//repository/minecraft-free-download-ipad_GM479516143.pdf
    • http://library.darmaagung.ac.id//repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://library.darmaagung.ac.id/repository/watch-ads-for-robux_GM431946152.pdf
    • http://library.darmaagung.ac.id/repository/coin-master-hack-apk-app_GM406889139.pdf
    • http://library.darmaagung.ac.id/repository/coin-master-free-spins-2021-generator_GM406889139.pdf
    • http://library.darmaagung.ac.id//repository/coin-master-free-gold-cards-link-2021_GM406889139.pdf
    • http://library.darmaagung.ac.id/repository/coin-master-email-rewards-link_GM406889139.pdf
    • http://library.darmaagung.ac.id/repository/free-spin-coin-master-twitter_GM406889139.pdf
    • http://library.darmaagung.ac.id/repository/win-free-robux_GM431946152.pdf
    • http://library.darmaagung.ac.id/repository/how-to-hack-m-coins-mcpe-master_GM406889139.pdf
    • http://library.darmaagung.ac.id//repository/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://library.darmaagung.ac.id/repository/free-spins-coin-master-no-human-verification_GM406889139.pdf
    • http://library.darmaagung.ac.id/repository/install-coin-master_GM406889139.pdf
    • http://library.darmaagung.ac.id//repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://library.darmaagung.ac.id/repository/daily-free-spin-link-in-coin-master_GM406889139.pdf
    • http://library.darmaagung.ac.id//repository/free-robux-2021_GM431946152.pdf
    • http://library.darmaagung.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdf
    • http://library.darmaagung.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ac.bin
9283e50d3811d2d894a2d1d4dd7c511a55c4a1f8b082113f62d4a8adbd8a332a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AC 26780 bytes
font_01_sfnt_off00008f67.bin
a1584dac0915afffe374fd321a91a63158f116b97d599b0b15246117d282c726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F67 19320 bytes

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