Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad05763f35f08ba…

MALICIOUS

PDF

40.1 KB Created: 2021-05-10 14:43:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9e1ab0efbb809309511204cee5a82b0c SHA-1: 1b10d81fcb64ef167f30d05761d558c1eef1ba59 SHA-256: 2ad05763f35f08ba3f92a5b6aff8e5554bb97c8497657425bdac6d8924ff3125
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9566

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/free-robux-generator-2021-no-human-verification-game-hack PDF link annotation
    • http://aessentia.com/images/robux-best_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://aessentia.com/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/roblox-system_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/coinmaster-free-spins-link_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
font_00_sfnt_off00003aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AAA 27024 bytes
SHA-256: 89c60da6fb07271a3ac0770b6ac7f0adce33bc925a320304b69b7c9b108e9a20
font_01_sfnt_off00007845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7845 19260 bytes
SHA-256: c7b90a5cfba5c375f14137d6940681acb1ecffd006539937a4c5badd529f0ccc

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