Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b1f66cfda5966a…

MALICIOUS

PDF

33.3 KB Created: 2021-07-08 18:40:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7a5f8f06af3ccc2fb98adf57173dd961 SHA-1: 1b9cec0eb4e4c25785f0d6f73d323913e1f10dee SHA-256: d1b1f66cfda5966a5ad1dea030a7d8f1ca497fcdb0196b4ada95f523f2b9d246
82 Risk Score

Malware Insights

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

The PDF document contains multiple lures related to game hacks and free currency generators, specifically mentioning 'Robux'. The primary malicious URL, http://netcdn.tw/app/431946152/robux-matchcomfree-robux-game-hack, is directly linked to this lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely involving a drive-by download or redirection to a malicious site upon clicking the link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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/robux-matchcomfree-robux-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/appkarma-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hacker-vs-pro-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generated_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/trustworthy-free-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-dope-characters-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-hack-downloader_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-roblox-rage_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-hack-no-verify_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cheat-codes-for-roblox-skywar-words_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pubg-uc-no-verification_GM1330123889.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spain_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_off000029f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F1 22664 bytes
SHA-256: f0d1b559e8312de9cce01ae7b01478428e313e9168e36e4b5e5bb4c34cadbdac
font_01_sfnt_off00005cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD3 19276 bytes
SHA-256: e12eaa9ee56d2b4a0c3760d94e761e70928f2a8d30c5b38c78d7961ece11124c

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