Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbdc8c07250db1c…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 04:02:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cda974e77530069b18d92c21df86e6ee SHA-1: 0b337d325b8172e1a421920b74d5bd6d3db6c063 SHA-256: 7cbdc8c07250db1cea1e614ec13c1e7000396d36d7a1f7a8c44d4342408b99db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically advertising "game hacks" and "free spins" for popular games. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-in-app-purchase-hack-game-hack, which is also present in the document body. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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-in-app-purchase-hack-game-hack In PDF document text
    • http://promotion.si/images/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://promotion.si/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://promotion.si/images/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://promotion.si/images/bloxpage-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_off00004943.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4943 24564 bytes
SHA-256: 901e9b3da268befabc639679d06fcb683525f4d112d3891167a26f3e9cc12ed0
font_01_sfnt_off000081ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EA 18352 bytes
SHA-256: 37c61889bff08c2bddd56bfb017dd32b1bdcae49f78bbe236cb4c9fcda307a6c

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