Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6e88cde3e92bf5…

MALICIOUS

PDF

32.7 KB Created: 2021-07-06 19:10:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 99fd8b4f9703f216f3548f4577baf573 SHA-1: 93be924e9b7c1a10a8b8fdd0c3c634ee6f396254 SHA-256: 1a6e88cde3e92bf5285c831f61debaa30433f4e0171b8dc95a0d7131bb4f1520
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hack generators for popular games like PUBG and Roblox. The presence of a 'Click here to download' lure further supports the malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

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/1330123889/pubg-uc-or-ag-game-hack In PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-adidas-asset-roblox_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-free-for-all-area_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-join-the-builders-club-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-no-login-or-sign-in-and-no-download-free_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-make-a-roblox-dominus-for-free_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/pokemon-go-free-xp_GM1094591345.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-unlimited-spin-hack-mod-apk_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
stream_001_off0000280a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x280A 23680 bytes
SHA-256: d0955b1adfaba419598bb217c5f21e420901b4380ab2dacb7cf9d91faf3a1025
font_01_sfnt_off00005dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD4 18124 bytes
SHA-256: ab4dfbf8443f17251ab595959ad5b4cce0609050120f36a3eb4a79837c55f617

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