Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8778f0c666db99…

MALICIOUS

PDF

32.5 KB Created: 2021-07-08 15:32:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cca6cdd83c12470c765abb3b209af065 SHA-1: b9175f4da7b55e7dfce4ef176a473ddf80748fa0 SHA-256: ab8778f0c666db99ea397ecfb5c99ab6f2201d6de7e22fa6afe59d72a7eb9b74
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/worst-roblox-avatars-game-hack PDF link annotation
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-cheats-for-robux-pc_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-egg-roblox-eggcellent_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-know-if-your-being-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/robux-cheat-2021_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-hacks-for-chromebook_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-things-roblox_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/robux-online_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/break-free-dangerous-woman-tour-studio-version-roblox-music-code_GM431946152.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_off00002b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B69 21576 bytes
SHA-256: bf524707505c40e904f8fbe2da36574636c6e772f88d48a97b068e32d6892ef7
font_01_sfnt_off00005a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6F 18904 bytes
SHA-256: 50d9d766445bbfaf298f5e9ee0478a866c6e9323076fc87bb8ecaa5c29193cba

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