Malicious PDF — malware analysis report

Static analysis result for SHA-256 4357ad09c4cee03c…

MALICIOUS

PDF

46.1 KB Created: 2021-05-16 05:06:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 42aea767b93eaa4bac466b50567fb1f0 SHA-1: 175f153633484a37bb4fd9c5f784d16bac3a28de SHA-256: 4357ad09c4cee03c0b4d446ca6117af9090334232d0753cf00446207c6835542
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and presents a fake CAPTCHA to trick users into clicking malicious links. The document body and heuristics indicate a social engineering tactic to drive users to external URLs, likely for further exploitation or malware delivery. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/431946152/free-robux-with-no-verification-2021-game-hack PDF link annotation
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/rbx-website_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/minecraft-client-download_GM479516143.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://www.payaljewelleryfiji.com/uploaded_files/userfiles/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B70 24896 bytes
SHA-256: 27e6074c2768b19b992c1df6ccc5faca490e6db160ea2d436dc8006f31dc7e68
font_01_sfnt_off000084bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BD 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00008e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7F 19368 bytes
SHA-256: aac922b8691acc9aa277dffee065f580c863b50a75d1a5b8a64d6db85e21622d

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