Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e15911e51391b2…

MALICIOUS

PDF

33.5 KB Created: 2021-07-19 21:25:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9897e343e19af072c6e7587c0affa3fa SHA-1: 6f199183ae54da0c61945a51e713fcd437211a48 SHA-256: d6e15911e51391b28eca7d5ced7ab5dcc533996c37e73f6b665678f0515da4d1
82 Risk Score

Malware Insights

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

The PDF document contains a lure for free game currency ('Robux') and directs users to a malicious URL. The embedded URL, http://netcdn.tw/app/431946152/how-to-get-free-robux-on-mobile-game-hack, is likely intended to download and execute a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the observed malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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-on-mobile-game-hack PDF link annotation
    • https://d-fankhauser-metallbau.ch/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://d-fankhauser-metallbau.ch/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://www.semrush.com/prices/In 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_off00002c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9C 22788 bytes
SHA-256: fcb8b9424adb92466c5302a26f434558dc35291d6f2f6a0eccc4baf47b45ceb1
font_01_sfnt_off00005f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7F 18856 bytes
SHA-256: fa1a8190e7a72137da410ffe9b2d58dd07c6ff94bff751b6d56240806fe703f8

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