Malicious PDF — malware analysis report

Static analysis result for SHA-256 d335cdfcea8a0f52…

MALICIOUS

PDF

42.8 KB Created: 2021-05-14 21:36:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fa1dbd97e727b8541193fec585702e1b SHA-1: 7bb6f48665fcf4fdc1c5401d2084822409b430bf SHA-256: d335cdfcea8a0f52d22f5ed50e4241c14f739634167945cd246c395576205125
122 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action to trick the user into clicking a link, likely to download a second-stage payload. The presence of multiple URLs and the ML classifier's high confidence score indicate a malicious intent. No scripts were extracted, but the document body contains embedded URLs that are likely part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-roebucks-game-hack
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/toolbox-for-minecraft_GM479516143.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-robux-hacks-no-verification_GM431946152.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/robux-without-verification_GM431946152.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/blogspot-coin-master-spins_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/is-minecraft-free-on-computer_GM479516143.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/level-coin_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-spin-and-daily-news-coin-master_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/toolbox-apk_GM479516143.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-coins-coin-master-2021_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-minecraft-alt-generator_GM479516143.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/rbxoffers-earn-free-robux_GM431946152.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-spins-coin-master-2021_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/get-robux-com_GM431946152.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/como-hackear-coin-master-2021-espaol_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/master-coin-free-link_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/free-robux-generator-codes_GM431946152.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/coin-master-hack-2021-ios_GM406889139.pdf
    • http://xn--apartementos-smfora-cala-ratjada-4vc.de/images/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aa4.bin
ae0c51836120b8afe71a7aea29eab72ba78d191a34c88dfaed9a11533d700389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA4 26240 bytes
font_01_sfnt_off000085cd.bin
60768b29a45169123c775a336c15772b774497df18e699e4ee663c92ad74688c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CD 17972 bytes

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