Malicious PDF — malware analysis report

Static analysis result for SHA-256 9601ab358f91e575…

MALICIOUS

PDF

44.9 KB Created: 2021-06-08 14:35:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3388983c7c5f96da92f275c6bb08f420 SHA-1: 19591bd5710beb815ef720dfec64585272e8ab98 SHA-256: 9601ab358f91e5758e5528bd3b7c5f50add084864a936d311d527dbfdef1f09c
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to gaming-related content, suggesting a lure for users seeking free in-game currency or hacks. The presence of a fake CAPTCHA heuristic indicates a social engineering tactic to trick users into interacting with malicious links, likely leading to a second-stage download. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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.tw/app/431946152/800-free-robux-2021-game-hack
    • https://www.99champions.com/uploaded_files/userfiles/files/robuxlove-net-free-robux_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/get-me-robux-for-free_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/is-roblox-free-on-xbox_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/rbxcity-free-robux_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/is-coin-master-hacks-safe_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/minecraft-hack-client-download_GM479516143.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-install-minecraft-for-free_GM479516143.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/www-coin-master-hack-xyz_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/reddit-coin-master-free-spins_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/daily-coin-master-free-spin-link-facebook_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-with-no-survey_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/how-do-you-get-free-robux_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/robux-free-robux_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-hack-people-in-roblox_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-hack-ios-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005203.bin
35b9b2724e11720f67597713d57bbfb9e395f45f0fe8039774ae4abe784d2b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5203 25720 bytes
font_01_sfnt_off00008bb2.bin
e8b30d020934e8c3a5d58a47654618811e7a9afd9168d814f1aa3bdab13ffe39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB2 18624 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.