Malicious PDF — malware analysis report

Static analysis result for SHA-256 4166cb6dab54903e…

MALICIOUS

PDF

32.0 KB Created: 2021-05-12 01:10:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8de82b6911d0eefa593c30bde3c002c2 SHA-1: 8f23d1f10025e732c926762a142803ff247cd211 SHA-256: 4166cb6dab54903ed0a2db8128d653fea4beb318539df37f928b63b2b875ec5e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a 'Coin Master Hack'. The ML classifier strongly indicated maliciousness, and the document body text reinforces the lure. The primary attack pattern involves social engineering to trick users into visiting a malicious URL, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 3

  • 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.
  • 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/coin-master-hack-2021-without-verification-game-hack In PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/get-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-roblox-followers_GM431946152.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D7E 22358 bytes
SHA-256: a4e5e57d1561085bdb83b28bf3c8f7a016ba8aa662dea84199487a12e32cb702

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