Malicious PDF — malware analysis report

Static analysis result for SHA-256 0984d8b9de3996e3…

MALICIOUS

PDF

48.0 KB Created: 2021-05-16 17:55:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4202f5a950b62d010daf8dd9f92579c5 SHA-1: 0b5d6725d69bde78fa1021b3187f56ec19c15e58 SHA-256: 0984d8b9de3996e3f498540aefd18261bd3793ccc151554efa90cba6fa1d96f7
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9013

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.xyz/app/431946152/roblox-sexually-game-hack PDF link annotation
    • http://3dmedicus.ru/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/roblox-rules_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://3dmedicus.ru/images/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://3dmedicus.ru/images/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://3dmedicus.ru/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://3dmedicus.ru/images/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://3dmedicus.ru/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://3dmedicus.ru/images/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://3dmedicus.ru/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://3dmedicus.ru/images/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://3dmedicus.ru/images/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://3dmedicus.ru/images/how-to-hack-a-roblox-account-easy_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_003_off0000484f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x484F 29704 bytes
SHA-256: a54f1b84de0d0b38e2e10ac7f98c3fa7ec5050901b587c80d841aefd2ab86864
font_01_sfnt_off00008c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3C 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000098e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98E4 18332 bytes
SHA-256: 167f004aaf573bac0fbc7d6959cd1dcde4a3b0ba0ae5768dad9a7ddf61376911

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