Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37d91edc26c5e7e…

MALICIOUS

PDF

42.1 KB Created: 2021-05-18 04:40:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 03197cc2334d7c6f233453a980570583 SHA-1: 7470b1456354b57e01c5271949a51f6205caedaf SHA-256: a37d91edc26c5e7ea81bdcf0994987a0c1df8de154a546e9db01c1feb4bca1d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically promoting "game hacks" and "free generators" to lure victims. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a clear intent to redirect users to potentially malicious websites, likely for phishing or malware distribution.

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/coin-master-mod-apk-game-hack In PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/roblox-pics_GM431946152.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/robux-adder_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/oginject-co_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/rbx-free-robux_GM431946152.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_off000049b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B7 24744 bytes
SHA-256: f977263e18f1668ef31581cd4e0d04e0d7964fdee5b00f91a060cfd2d6174fab
font_01_sfnt_off000082a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A1 18068 bytes
SHA-256: b41b00b03ce87291eba0dd85e91a6f7f7f395b53aa8529f4df5d3819e50e6afc

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