Malicious PDF — malware analysis report

Static analysis result for SHA-256 b221cbbc5cc245d3…

MALICIOUS

PDF

42.7 KB Created: 2021-05-15 06:15:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 32761ba244a691d31f4aa8d5e4e0934a SHA-1: 224b0cae24026ff77ebefef93ceb72ba9c7feb12 SHA-256: b221cbbc5cc245d3155d7e5fa567b89fb39bb70fadf89d45ad92d058a4d26fd7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as "free generator / game hack" content. The primary URL, https://netcdn.xyz/app/406889139/hack-coin-master-spin-apk-game-hack, is identified as a malicious redirector. The document's structure and embedded links suggest an attempt to lure users into downloading potentially malicious payloads or visiting further compromised sites. No scripts were extracted, but the presence of multiple malicious links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/hack-coin-master-spin-apk-game-hack In PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/master-coin-free_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/roblox-source_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://www.dallahgrp.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-no-human-verification_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_003_off0000484d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x484D 27128 bytes
SHA-256: 1ccf859787c7b4f8a5666ec46bdb91e7acd3602da8b03c18805ebc4e7246a692
font_01_sfnt_off000085c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C7 17892 bytes
SHA-256: 38303170ac9c6ca0f2851823f29ecc879fead5c3d3518135c6ab8fad8fa3f0a9

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