Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51ca5074830b48c…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 09:42:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 475ef388d6a65d6a4710a89d52728f36 SHA-1: 7bf5380a3304626d83fe062f980e8151f5d45465 SHA-256: c51ca5074830b48c0b59173c3ba948792d51ba1affdb19ac328299f81ee26599
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting game hacks and free generators. The primary lure appears to be a 'coinmasterfreespinlink-game-hack' URL, which is hosted on suspicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to redirect users to potentially harmful content.

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/coinmasterfreespinlink-game-hack In PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/block-best-robux_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/roblox-points_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/minecraft-wurst_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-spins-link-hack_GM406889139.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_003_off00004892.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4892 26084 bytes
SHA-256: d6c9519886f2a2339d8baf2168271021da76a1edbfe4c2c16b53aa92b9f26a58
font_01_sfnt_off0000830a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x830A 18224 bytes
SHA-256: 5ac1ce2ac88e7b98134a23e8a83b406c8e40c127b2dbab09a4edbea00c7c47cb

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