Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df05c738ea0c0da…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 02:47:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 98b89cd53f38efd26540513458166f7b SHA-1: d7da95b9d7a367bd8a53acf63af7f4e4123d2e32 SHA-256: 6df05c738ea0c0da0707524f4126c2d6f5fe0c7c62bc38a5ab536bfcd815d6ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'hacks' for popular games. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-15-free-spin-link-today-game-hack. This lure is designed to trick users into clicking through to potentially harmful content. No scripts were extracted, but the embedded links and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/coin-master-15-free-spin-link-today-game-hack In PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/gain-robux_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-free-name-change-hack_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-group-fund-robux-free_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-how-to-get-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/pubg-uc-yatr_GM1330123889.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/ho-to-make-a-shirt-in-roblox-2021-for-free_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-hack-script-booga-booga_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/how-to-get-robux-for-free-2021-without-builders-club_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/free-robux-website-hack_GM431946152.pdfIn PDF document text
    • https://www.acorn-medical.com/uploaded_files/userfiles/files/robux-xyz_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
stream_002_off00003367.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3367 22772 bytes
SHA-256: 7c1425aa67fd50e6e6c85b74352fda60829d9f29bdc245ea45018f7f729f6f16
font_01_sfnt_off00006654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 18936 bytes
SHA-256: dade731e6700c356e43930ce2166ac8a04dff18bb71904978fd7c0d5f6a2bba6

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