Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2fce270c865ac4…

MALICIOUS

PDF

36.9 KB Created: 2021-05-22 13:55:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ab91b2f0e6a96bccf632d3497d698126 SHA-1: 10971f47ea20c4eea7b46ff81e4f60e352bd674a SHA-256: ef2fce270c865ac472d7f59d53098eb4292c810cea8a05b7be784c781b7534c5
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 0.9447

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/make-free-robux-game-hack PDF link annotation
    • https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-facebook_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
stream_002_off000032bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32BB 26004 bytes
SHA-256: dad3347a64ef745147476a90e7f3a8567526bf2de3cae53feffd112d061f059e
font_01_sfnt_off00006ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDB 18608 bytes
SHA-256: ffc801fe6c311414aab45f29f725ac19f85306497fb99419c1a1229f9950fbca

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