Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c5d68fc17b32d0…

MALICIOUS

PDF

37.6 KB Created: 2021-05-21 04:32:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dccec939f303114646255d5140028dee SHA-1: 5f7b910bfe5aa56ed3c3f73ea9fad9d8c9b6ed51 SHA-256: 61c5d68fc17b32d0b23a2fc692995e1f9353dd3d89ada85375d7c123e1e312e2
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a "Roblox Free Robux Hack" and a fake CAPTCHA, directing the user to click a link. This link, https://netcdn.xyz/app/431946152/roblox-free-robux-hack-game-hack, is associated with game hack lures and likely serves as a redirector to a malicious site for further exploitation or payload delivery. The presence of multiple similar URLs hosted on julo-it.net further supports a pattern of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

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/roblox-free-robux-hack-game-hack PDF link annotation
    • http://julo-it.net/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33BD 26592 bytes
SHA-256: 2ed99576e71895dd2266e92efc1b2e572d69598b71db943d592a21d30276c5f1
font_01_sfnt_off00007160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7160 18488 bytes
SHA-256: 44072fbb5c45a7604268a2c6438126b7db3492802a9c8847ecb07522db400813

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