Malicious PDF — malware analysis report

Static analysis result for SHA-256 444ea321c1d70627…

MALICIOUS

PDF

42.2 KB Created: 2021-05-13 04:37:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cb1cb228c46a06cf102ab6603aa476e2 SHA-1: e38c9ce51d79110e4343e8486a361a10b75895a5 SHA-256: 444ea321c1d7062723e2628ebc4a3fffae618e67aa4d21b8a5b7095685b97d35
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a large number of external links, many of which are related to game hacks and exploits. The document body and embedded URLs suggest a social engineering attempt to trick users into clicking malicious links, likely leading to malware downloads or further compromise. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/roblox-promo-code-to-get-free-robux-game-hack
    • https://ambarevleri.com/images/how-to-hack-coin-master-computer_GM406889139.pdf
    • https://ambarevleri.com/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • https://ambarevleri.com/images/blogspot-coin-master-free-spins_GM406889139.pdf
    • https://ambarevleri.com/images/coin-master-spin-ml-link_GM406889139.pdf
    • https://ambarevleri.com/images/coin-master-hack-apk-download-for-android_GM406889139.pdf
    • https://ambarevleri.com/images/minecraft-wurst-hacked-client_GM479516143.pdf
    • https://ambarevleri.com/images/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdf
    • https://ambarevleri.com/images/link-for-free-coins-in-coin-master_GM406889139.pdf
    • https://ambarevleri.com/images/rbx-place-free-robux_GM431946152.pdf
    • https://ambarevleri.com/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://ambarevleri.com/images/roblox-got-talent-piano-hack_GM431946152.pdf
    • https://ambarevleri.com/images/free-robux-no-scam_GM431946152.pdf
    • https://ambarevleri.com/images/games-that-give-free-robux_GM431946152.pdf
    • https://ambarevleri.com/images/free-robux-2021_GM431946152.pdf
    • https://ambarevleri.com/images/minecraft-xbox-360-free-download-code_GM479516143.pdf
    • https://ambarevleri.com/images/how-to-get-free-gamepasses-on-roblox_GM431946152.pdf
    • https://ambarevleri.com/images/get-free-spins-coin-master-october-2021_GM406889139.pdf
    • https://ambarevleri.com/images/get-free-robux-2021_GM431946152.pdf
    • https://ambarevleri.com/images/roblox-games-with-free-vip-servers_GM431946152.pdf
    • https://ambarevleri.com/images/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047a6.bin
50bf74d58ca1b02c56c726d8f999953cc05496283a7505bd196590f2bbc86e15
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47A6 25120 bytes
font_01_sfnt_off000080fa.bin
57e6eef1fbc3af66d8c5b48d94799429ebee4b6256a60c8d2844d61f1a05fc0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x80FA 18780 bytes