Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e52c4a3a3a72fe…

MALICIOUS

PDF

47.7 KB Created: 2021-06-04 04:38:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7aad9a9f91410b85add9a92ef49fc9c0 SHA-1: 507c8ddda1b50c9899134f4d08d9b660da3f3d5e SHA-256: b5e52c4a3a3a72fecf52caa659a282e8633fea557435bd2bbc774811567a52a4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document employs a fake CAPTCHA lure to deceive users into interacting with malicious links. The document body and extracted URLs heavily feature themes related to 'Free Robux' and game hacks, suggesting a scam or phishing attempt. The presence of numerous external links, many with SEO-like titles, indicates a link farm designed to direct users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-robux-no-human-verification-not-fake-game-hack
    • http://libnh.stikesnh.ac.id/repository/what-do-points-do-in-roblox_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/roblox-land-free-robux_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-robux-thumbnail_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-roblox-gift-card-codes-2021_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-androd-cheats-2021_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/roblox-hack-com_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/bad-minecraft-free_GM479516143.pdf
    • http://libnh.stikesnh.ac.id/repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-robux-ad_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/minecraft-java-for-free_GM479516143.pdf
    • http://libnh.stikesnh.ac.id/repository/100-free-spins-for-coin-master_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/coin-master-spin-hack_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdf
    • http://libnh.stikesnh.ac.id/repository/minecraft-build-hacks_GM479516143.pdf
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-apk-33-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005113.bin
9e086bf202739e9289d484866e835df06392b1426ee0b522b17d0cd92ab5b8a3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5113 25072 bytes
font_01_sfnt_off00008b83.bin
f93be4a794c6c5ad11d64b7dadfde0dce62082bdc05c6d3b82dc43f0b8b31472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B83 2924 bytes
font_02_sfnt_off0000959e.bin
4e69f82336e760bbe29eb0d83d0109365c7132b64ae5d04478be823d6eb57cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x959E 19028 bytes

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