Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a678f222f96260…

MALICIOUS

PDF

33.5 KB Created: 2021-07-09 14:49:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: aeca74c76ace8fc33ba150e10a0ef04e SHA-1: ad5a5be7be98ed741d8747d6e34bc366b1a7e378 SHA-256: d9a678f222f9626020151e8b72a8292de7c48ee217457a3cbb3402ef8e933442
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a prominent lure for 'Free Robux' and a call-to-action link, strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the document's content indicate an attempt to redirect users to potentially malicious sites for illegitimate gains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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/431946152/free-robux-without-verification-2021-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-free-shirts-xxtentacion_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/barren-roblox-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-a-free-2021-roblox-acc_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-printable-roblox-pictures_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-hair-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/buy-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-roblox-generator-activation-key_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-draw-2-roblox-rules_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-card-codes-2021-august_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_off00002aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AED 22100 bytes
SHA-256: 89c17a6811736af030e79a6c76a0af7fca0a6192d85f48749cb5fbb2c1991ca8
font_01_sfnt_off00005be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE0 19840 bytes
SHA-256: b77f23397a098c4dc3ad9c6ed3599495bca59c8db3ab458779c0241217e21131

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