Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9cb0211f66e229…

MALICIOUS

PDF

32.6 KB Created: 2021-06-25 12:52:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 25d3e40ab05dfcb1ee5c48a2a8a65fad SHA-1: 2dbea767a121a72d74bd5fe00db076ad67ea72b9 SHA-256: 3a9cb0211f66e229c728e03de5f8ae4909691afa88d7f0876bbd2aa6c2231a19
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, masquerading as a game hack or generator. The document body and embedded URLs suggest a lure for free game items or cheats, aiming to trick users into visiting malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

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.co/app/431946152/roblox-cheat-engine-retail-tycoon-2021-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-get-free-cotton-candy-roblox-mm2_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-giveaway-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-cheat-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/pokemon-go-free-7k-eggs_GM1094591345.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-apk-ios-download_GM406889139.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_off00002ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AB7 21272 bytes
SHA-256: f919fb72a8b0c92bff76ad98f784f6cd5bc3f446736602fb805dc57234b1fd71
font_01_sfnt_off0000593b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x593B 19460 bytes
SHA-256: 192751b72c377db9f67b9cec080e9ac7284e9bdebedf60ad712a03fa6e662dd5

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