Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1accaf592a4769…

MALICIOUS

PDF

35.1 KB Created: 2021-06-26 22:54:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4b6fec2ea07cc73cdeb2f086ea2985d5 SHA-1: abd99861c5be2118a4e4bae5b582e145279130a9 SHA-256: 0f1accaf592a47698af98735f075f15beaac84c42fe98874bb3c7ca8250fccf0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are presented as game hacks or cheats for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO spamming operation. The primary URL, 'http://netcdn.co/app/431946152/roblox-adopt-me-free-ride-potion-game-hack', is directly associated with a game hack lure. While no scripts were explicitly extracted, the nature of the links and the 'ML_NYX_PDF_MALICIOUS' flag suggest a high likelihood of leading to malicious content, such as malware downloads or phishing pages, which aligns with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' techniques.

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/roblox-adopt-me-free-ride-potion-game-hack PDF link annotation
    • http://bw.ac.th/userfiles/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-lumber-tycoon-2-free-vip-server_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/cheat-codes-for-roblox-on-the-games_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/jailbreak-script_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-do-you-hack-gems-in-royale-high-roblox_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_off00003106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3106 22716 bytes
SHA-256: 58e3375b74bf2eed8ea47332d67c7a2c9b45347b973e97b916839d4e12f96587
font_01_sfnt_off000062d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 19576 bytes
SHA-256: 02619cbf4e2c252b79ef10037f067374b7e98c2cb620e830815a004ac9a47d13

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