Malicious PDF — malware analysis report

Static analysis result for SHA-256 72633c87ea3dd92b…

MALICIOUS

PDF

46.2 KB Created: 2021-05-15 23:38:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e31c8e24cb92f59eabbc32a1a64674d1 SHA-1: 64a8b1bac9364a1fe3f22adc10f5e8fba5c8558e SHA-256: 72633c87ea3dd92b3e4e24fc0075b2427e1e95da60206925ef0404b760e41c9b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure and a large number of external links, many of which point to scam-related content like free Robux or game hacks. The ML classifier also flagged this PDF as malicious. The primary goal appears to be redirecting users to potentially malicious or scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/how-to-get-free-roblox-gift-cards-game-hack
    • https://pagadder.com/images/roblox-fun-com-free-robux_GM431946152.pdf
    • https://pagadder.com/images/free-roblox-accounts-that-work_GM431946152.pdf
    • https://pagadder.com/images/minecraft-that-you-can-play-for-free_GM479516143.pdf
    • https://pagadder.com/images/mobihack-roblox-hack_GM431946152.pdf
    • https://pagadder.com/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://pagadder.com/images/coin-master-free-spin-link-daily_GM406889139.pdf
    • https://pagadder.com/images/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://pagadder.com/images/robux-hack-no-verification_GM431946152.pdf
    • https://pagadder.com/images/free-spins-october-28-2021-coin-master_GM406889139.pdf
    • https://pagadder.com/images/can-you-give-me-robux_GM431946152.pdf
    • https://pagadder.com/images/free-rare-cards-for-coin-master_GM406889139.pdf
    • https://pagadder.com/images/doctor-louie-roblox_GM431946152.pdf
    • https://pagadder.com/images/free-robux-just-enter-username_GM431946152.pdf
    • https://pagadder.com/images/free-robux-site_GM431946152.pdf
    • https://pagadder.com/images/roblox-gift-card-for-free_GM431946152.pdf
    • https://pagadder.com/images/is-roblox-hacked_GM431946152.pdf
    • https://pagadder.com/images/coin-master-free-cards-link_GM406889139.pdf
    • https://pagadder.com/images/play-minecraft-online-free_GM479516143.pdf
    • https://pagadder.com/images/free-roebucks_GM431946152.pdf
    • https://pagadder.com/images/minecraft-java-edition-key-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046b2.bin
97e3ddd9c8a0803ef36d5a8140738a7bb891995c58dca67054914427a7f01ad7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46B2 26288 bytes
font_01_sfnt_off0000837b.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x837B 5696 bytes
font_02_sfnt_off0000908d.bin
4ca4edcee29dbb5ec5fd43b786ee3a040f637d4fa80ece8255e459f77acc63d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x908D 18740 bytes