Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c0818ea5c17474…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 22:47:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: df60ebcd164d43f957c0e08afb853f4c SHA-1: c63db14ab9259b2b67498ed389ce07a2d0084df1 SHA-256: b9c0818ea5c174749fd88b3cc1f34871d13541a0b17ff768f62c78b549ce0e8a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a lure related to 'free Robux' and game hacks, strongly indicating a phishing or scam attempt. The primary URL, http://netcdn.tw/app/431946152/how-to-get-free-robux-hack-2021-game-hack, is a key indicator of the malicious redirection. While no scripts were explicitly extracted, the nature of the lure and the embedded URLs suggest a potential for further malicious activity, such as downloading additional payloads or leading to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-get-free-robux-hack-2021-game-hack PDF link annotation
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/how-can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-robux-generator-2021-ad_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/sword-simulator-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/robux-generator_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/how-to-hack-accounts-on-roblox-2021-october_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/roblox-robux-generator-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/install-free-game-coin-master_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_off000031c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C5 22636 bytes
SHA-256: 34522607e2f40649a256c2a315cfb2cace3af88d808f3d3c9508814191574646
font_01_sfnt_off0000647e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647E 19556 bytes
SHA-256: f212cd4c9928ae438aa9e71512a10d010177ec0841fcd267cfedc658cf456714

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