Malicious PDF — malware analysis report

Static analysis result for SHA-256 0385f5762a6f0181…

MALICIOUS

PDF

35.0 KB Created: 2021-06-26 13:24:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c42c0463610e9109e5577cbc6d0793f8 SHA-1: f942c712e31189a4fba4dc43bf9c6be5befb229b SHA-256: 0385f5762a6f01817e9cd5af9ccea11a185a74def5009e7beff3867bcd6eb924
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lure users with promises of game hacks and free currency, directing them to malicious websites. The ML classifier strongly indicated maliciousness, and the PDF structure and content align with a phishing or scam attempt. Although no scripts were explicitly extracted, the presence of embedded URLs and the lure suggest a phishing campaign, likely initiated via spearphishing attachment.

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.co/app/431946152/cool-hacks-on-roblox-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/roblox-free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/robux-game_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/pokemon-go-free-bag-upgrade_GM1094591345.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spins-link-blogspot-today_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_off000030f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F2 23040 bytes
SHA-256: 046c6a22e7956be577fa39386659a0b9c23820b699a11382ef00d1e2e07fb860
font_01_sfnt_off000064d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D7 18656 bytes
SHA-256: 4a7bef0f542f732b29ddfa5155e727f7d447b16d6033fee1b1049b31df73f334

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