Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb61eff89e1727b4…

MALICIOUS

PDF

45.9 KB Created: 2021-06-09 07:54:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fd46055e688ee9ac2501afd1fc941f09 SHA-1: ea840e05e815b886e3064a1a70fc63f7d292d48f SHA-256: eb61eff89e1727b4220463171d75985c21c06dd94ec695c8470cb06e38c56f2a
122 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'free Robux' and a fake CAPTCHA, designed to trick users into clicking embedded links. The primary link directs to a site offering game hacks, which is a common social engineering tactic. While no scripts were directly extracted, the PDF structure and heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-get-free-robux-by-using-inspect-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/bot-followers-free-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/pubg-uc-ykleme-hile_GM1330123889.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-online-coding-courses-for-kids-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-no-verification-2021-ios_GM431946152.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
stream_004_off000052cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CF 25800 bytes
SHA-256: 952cc799a0d0bf961157a09e3311f15edb6c54cd9c43dfc76e06e67967d89ae8
font_01_sfnt_off00008e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E26 19232 bytes
SHA-256: ed2ca85ae7133e34d752ce8007ecd74df0954559a7f8a7d2485438dec1a66b9d

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