Malicious PDF — malware analysis report

Static analysis result for SHA-256 0463bbbaf5688f20…

MALICIOUS

PDF

48.0 KB Created: 2021-06-09 08:47:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bcc00734b4c1b343ae1775cb8e30d400 SHA-1: c9919907320917ba9eb034187e074dbc624f60a2 SHA-256: 0463bbbaf5688f20a5b41a82aa83e0b77ae7dd9af10c1b5189feef5afbc9edad
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a lure for a 'free generator / game hack' and displays a fake CAPTCHA to trick the user into interacting with the content. The embedded URL points to a malicious redirector, likely intended to download and execute a second-stage payload. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used for such malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/free-roblox-music-sound-ids-game-hack PDF link annotation
    • http://bit-sky.com/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://bit-sky.com/images/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/hack-to-beome-supertall-in-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/hack-a-game_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/robux-today_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/comment-hacker-roblox-facilement-sur-pc-2021-en-francais_GM431946152.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_004_off00004f8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8E 33108 bytes
SHA-256: 52f44518bb97cd733b72f0a9ea8df0aa1764066898acf78b73bcde58defa0476
font_01_sfnt_off000098c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98C9 18576 bytes
SHA-256: 23d3830e7b1eb3025e2e6b562eabc38631ba87d3df59f7966a0583104c08c2bc

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