Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d418ff5a94be7b…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 07:06:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f37170cbaac1960006da67e1c85d4a81 SHA-1: 80f65d767289949c111c9dab108c9608fbdd417f SHA-256: 71d418ff5a94be7b4691745f030426a38b2b31ca35997fb2feda4f452df9f909
142 Risk Score

Malware Insights

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

The PDF document contains numerous links disguised as game hacks and generators for popular games like Roblox and Minecraft. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to a lure for game hacks. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirect URL, which likely serves as a gateway to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/youtube-how-to-get-free-robux-game-hack PDF link annotation
    • https://knj.com.tw/image/data/files/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/injecthack-com-roblox-hack-injector_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-hack-roblox-accounts-for-robux_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_off00002fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB5 21308 bytes
SHA-256: dcac298b7f9797c66dd181a81943bebd3e9df7f9df7ccd953b6769da9d7b6233
font_01_sfnt_off00005e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2C 19144 bytes
SHA-256: d5dc46d66495a28e13f0948931c4fe5cc77d6e5ab0084fce9cb8e9a7871dae1a

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