Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efe8fe2ba0ca72d…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 18:33:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 87438a6182c9b45029874f8680c962bd SHA-1: fca4f5db4f9ee57d9bd50e78d97ae329232cfde2 SHA-256: 9efe8fe2ba0ca72df350278d87b03726323a1fadeff5618c0c6ba61a70123817
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly lures users with promises of free in-game currency and items for popular games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, indicating it likely serves as a phishing or scam document designed to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and the ML detection suggest a high likelihood of a malicious download or credential harvesting 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/how-to-get-free-coins-for-coin-master-game-hack In PDF document text
    • http://www.emotional-training.com/storage/editor/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/roblox-free-bc-generator_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/roblox-robux-hack-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/create-a-roblox-fighyer-free-online_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/free-cookie-logger-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/roblox-1m-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/robuxin-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/dance-sim-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/robuxy-com-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/rbx-website_GM431946152.pdfIn PDF document text
    • http://www.emotional-training.com/storage/editor/files/robux-generator-without-human-verification-2021_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_off00003216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3216 22736 bytes
SHA-256: 6fdd79bf5d05d1b554686b8b986aa10c0bd9e71b7834fe35f79ee05345fc8778
font_01_sfnt_off0000651c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 18164 bytes
SHA-256: dbcb18f7bfdddec59cdd21c6f01db76fd89479467b7af7aa3f1646e0963d7b6f

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