Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88b20371942d03f…

MALICIOUS

PDF

48.6 KB Created: 2021-06-10 12:21:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5c88540426cbdcb2a0b140257074aa3a SHA-1: ad7036685189782d25959a6b2cbca2e22be749bc SHA-256: d88b20371942d03f2f0927f983f5b42fc153dfea941d7f476b6ad560832d5b93
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Free Robux' and links to external URLs, indicating a phishing or scam attempt. The ML classifier also flagged the PDF as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious websites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/free-robux-sites-like-rocash-game-hack PDF link annotation
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000507d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507D 26168 bytes
SHA-256: 774b2156527865ee3619b9ae38cd439b4d9f1956b35692137e624d56a587e8b5
font_01_sfnt_off00008cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF4 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000999c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x999C 18804 bytes
SHA-256: c218613169360204dcd177b7a4af2941ea048029d1eecd2125619a7235b12247

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