Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d43a9cb56654ea8…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 18:01:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5b63f16a030e790b16856841be03d945 SHA-1: e1b8cde2bfbe75f1618a6272942e57184683e8a7 SHA-256: 8d43a9cb56654ea8c64605211ba3bac0c688a8cca6acfac4dd774b1c2baa2d3b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a document body explicitly advertising 'free spins hack' and 'free robux', which are common lures for phishing or malware distribution. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' confirms this, and the ML classifier strongly indicates maliciousness. The embedded URLs likely lead to sites attempting to trick users into providing credentials or downloading further malicious content.

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.tw/app/406889139/coin-master-free-spins-hack-without-human-verification-game-hack PDF link annotation
    • https://tnupacktour.com.tw/image/data/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-the-tix-beanie-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/helpcom-free-robux_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-rs-game-in-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/bug-free-uniform-of-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/robux-hack-2021-fluxx_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/game-give-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_off00002fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC9 23136 bytes
SHA-256: 47699fffdd9e6704290b31d02ab23ad1cf3e7bca17eddf5d8f31b617d05e7b3e
font_01_sfnt_off00006383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 19244 bytes
SHA-256: 30c6eda7860abcbe2539b7325d9fcd8b1a95fd07748c36c511e8089874e2a7d7

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