Malicious PDF — malware analysis report

Static analysis result for SHA-256 637168eb37812580…

MALICIOUS

PDF

37.5 KB Created: 2021-05-25 08:00:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d996365babb9aada257fefafad491d79 SHA-1: 4cbd88ae1b13829714c9c173e48e92a5c8b1ffe7 SHA-256: 637168eb3781258014e8047f64daccb9353d4f700280fc868a97fd9c3db01699
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and presents a fake CAPTCHA to trick users into clicking a malicious link. The embedded link directs to a site offering a 'free generator / game hack', which is a common social engineering tactic. No scripts were extracted, but the document body and heuristics indicate a phishing attempt to redirect users to a potentially malicious website.

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/free-robux-master-game-hack PDF link annotation
    • https://elearningmadrasah.min2madiun.sch.id/__statics/gudangsoal/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearningmadrasah.min2madiun.sch.id/__statics/gudangsoal/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://elearningmadrasah.min2madiun.sch.id/__statics/gudangsoal/files/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://elearningmadrasah.min2madiun.sch.id/__statics/gudangsoal/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://elearningmadrasah.min2madiun.sch.id/__statics/gudangsoal/files/minecraft-free-ios-2021_GM479516143.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_off00003200.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3200 27076 bytes
SHA-256: f3f8827ea468f9e2d47a11c091b58289fa1d795d117975ff7dd89a11adb6de57
font_01_sfnt_off00007091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7091 18544 bytes
SHA-256: 5f92163030842751a82ce86b738a68b4d97fee0a57e838fb4c20f827a47ffbab

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