Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b4f77c4c207865…

MALICIOUS

PDF

33.7 KB Created: 2021-07-09 02:29:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4428849d9dd8863685ae1ce5a9cc07e8 SHA-1: 656b51cd9644b552195c160ff01856b10d458945 SHA-256: e1b4f77c4c207865a8aaf7783f509239861f339f598c9d96c66312d23f446255
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to a malicious redirector, specifically http://netcdn.tw/app/406889139/apps-to-hack-coin-master-game-hack, which is designed to lure users with promises of game hacks and free in-game currency. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links and the lure content strongly suggest 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/apps-to-hack-coin-master-game-hack In PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-accounts-logins-and-passwords-roblox_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/pubg-770-uc-ne-kadar_GM1330123889.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-unredemeed-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-admin-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-scp-site-61-card-hack_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/husky-1-million-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f4d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F4D 22508 bytes
SHA-256: 13df4abeda4a538dc16f8448d51ebdca7f78dfcb5a19a08d34ed6333e7326737
font_01_sfnt_off0000616a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 18180 bytes
SHA-256: f0873b9a9a3567aab3602ed3b46c72e29c0674406730caa0d836ec2652e18507

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