Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88d7d5bcaf73cb8…

MALICIOUS

PDF

34.5 KB Created: 2021-06-03 08:14:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b4f67939155566dc12fabcfd9944bbed SHA-1: eccd5e82a8ac3e341eda515087f0e5e69e460be8 SHA-256: e88d7d5bcaf73cb89f47313e9f1a114738d93d6a67f01de9a02ecbb1a6598b32
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free spins" for games like Coin Master. The embedded URL `https://netcdn.online/app/406889139/coin-master-free-spin-codes-game-hack` is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.online/app/406889139/coin-master-free-spin-codes-game-hack In PDF document text
    • http://opac.acehresearch.org/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/robux-app_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F1F 25340 bytes
SHA-256: 792ae4bdc69088f4f50d15d9f6cf81db9c8a651217bfe7be0604dff6869ef58b

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