Malicious PDF — malware analysis report

Static analysis result for SHA-256 1393c073fb441df5…

MALICIOUS

PDF

35.5 KB Created: 2021-07-08 21:23:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c898b661c4ef445bcc0886aeb5e59054 SHA-1: a586eb8e66a535283b7f23b92ab15f0b588849f6 SHA-256: 1393c073fb441df5ee99a477f2b7c5bb460e74712fd43286836185d5a0a13053
168 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/ear-free-spins-for-coin-master-game-hack. This infrastructure is used to lure users with promises of game hacks or free spins, likely leading to further malicious content or exploits. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • 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/406889139/ear-free-spins-for-coin-master-game-hack In PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/make-robux_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/the-cheat-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/roblox-work-at-a-pizza-place-cheats-2021_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/how-to-hack-roblox-phantom-forces-aimbot_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/how-to-make-clothes-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/roblox-shorts-free_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/unredeemed-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/hacked-client-for-minecraft-bedrock_GM479516143.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_off000034a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A9 23072 bytes
SHA-256: 105a86778ce84274f997bf75e39f254587a7b2e3552f589dad59b75031cc8e02
font_01_sfnt_off00006895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6895 18176 bytes
SHA-256: 8cb6e5092b491550e7b215afb87da4ecb4c91e5b5bb3d5caa4fd4e6f3eb8d81f

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