Malicious PDF — malware analysis report

Static analysis result for SHA-256 396228f7ad43b317…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 13:43:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 43eb69fe59c71a8a293015b05c9b6acd SHA-1: 8f58744ae021bd923df40679e906285abab44530 SHA-256: 396228f7ad43b317df18dfe93068e8506274e602f7859c9c12330b8c171d68f4
142 Risk Score

Malware Insights

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

The PDF document contains numerous links, presented as lures for game hacks and free currency, which is a common social engineering tactic. The primary link, http://netcdn.tw/app/431946152/roblox-hack-2021-game-hack, likely leads to a malicious download or exploit. The heuristic firings indicate a link farm designed to redirect users, and the ML classifier strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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 http://netcdn.tw/app/431946152/roblox-hack-2021-game-hack PDF link annotation
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/roblox-phantom-forces-all-guns-free-and-attachments_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/roblox-prison-life-cheat-engine_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-to-hack-roblox-accounts-using-console_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/auto-jump-roblox-hack_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-tiktok-likes-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317B 22772 bytes
SHA-256: a0f761f6d3f820d5247698aa77febaf6043a52780f8e7a56ea7f30a5d8c7db7f
font_01_sfnt_off00006481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 19056 bytes
SHA-256: 98be41374c31724b7a878275a9dc475d7e9908887f4f5935c763b7161266aa61

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