Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1686605b50df87…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 12:16:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0bd6986f1b8a011a2d22ce68eb78f37f SHA-1: 8bf1c83df5f45d0bee48c0cf53c7b237aadbe62a SHA-256: 4d1686605b50df87bb603c1397f748c84bc0b70fe242e9ab49a1b96dc7bf6f08
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, masquerading as generators for free game items and accounts. The primary lure URL is http://netcdn.tw/app/479516143/free-mojang-account-with-minecraft-game-hack, which is likely a redirector to malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of similar links, suggesting a campaign to distribute malware or phishing pages. No scripts were extracted, but the document's structure and embedded links strongly suggest it's a malicious lure designed to trick users into visiting potentially harmful sites.

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.tw/app/479516143/free-mojang-account-with-minecraft-game-hack PDF link annotation
    • https://pustaka.mic.sch.id//repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/raviz-cheating-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-robux-for-offers_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/robux-hack-cheat-engine-62_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/obby-gives-you-free-robux-no-password-required_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/conseguir-robux-en-roblox-hack-website_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/nuevos-hacks-de-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-all-gamepasses-for-free-script_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-hacks-for-free-robux-2021-febuary_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/comment-avoir-des-robux-gratuitement-sans-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-robux-live-stream_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-robux-no-claiming-gift-cards_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/tiktok-free-online-download_GM835599320.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/robux-fun-com-free-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_off00003376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3376 22504 bytes
SHA-256: f88a71f12e1e5517a31d5a318a81cf9a7198bc78253363b1162acf53b767bea2
font_01_sfnt_off000065a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A5 18688 bytes
SHA-256: 60143c81e88e14cdfb7631f3b4f61d617c046054e7601d01d98adb150323207f

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