Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8d401b3b6d7df4…

MALICIOUS

PDF

34.3 KB Created: 2021-07-08 08:43:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a73d51898d83df803445cf99c0ab70eb SHA-1: dba1d141198d2760891f9f212b4fe24748ea5678 SHA-256: bb8d401b3b6d7df4618bc080afb08d4ffbb9a8b3ccc9b5844d15664f73b03cd9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free generator / game hack" lures. The primary redirect URL is http://netcdn.tw/app/431946152/yuno-surveys-for-free-robux-game-hack. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for survey scams or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/yuno-surveys-for-free-robux-game-hack In PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/roblox-free-followers_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-robux-without-doing-anything_GM431946152.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/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/cheater-arsenal-roblox_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-robux-now_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/robux-hack-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://gobeepbeep.co.uk/media/storage/editor/files/coin-master-daily-free-spins_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_off00002ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA3 22452 bytes
SHA-256: d052b5c9ca7c046e4ac5199b945a99e3e271347db1476f8b02319a7f72838088
font_01_sfnt_off00006073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6073 19172 bytes
SHA-256: 33e6373894da00da7a4d902adc19c83edf6b90def46a5eb375e079f89e15d2bc

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