Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb7609c595a04d5…

MALICIOUS

PDF

42.0 KB Created: 2021-05-16 16:59:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9b84bdf464f122a67f48dc6568a19aef SHA-1: e4115bf65bbdf56d6c9239484db9b66e254a6a3d SHA-256: 2cb7609c595a04d5bef627147655442c492b536f5d33da067a23c54c4c4d9b7b
160 Risk Score

Malware Insights

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

The PDF document contains links that redirect to known malicious infrastructure, specifically promoting game hacks and currency generators. The document body and embedded URLs suggest a lure for users seeking in-game advantages, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness.

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/legit-free-spins-coin-master-game-hack In PDF document text
    • http://e-mailservis.cz/images/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free-items_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/synapse-roblox-free-download_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_off00004a43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A43 24344 bytes
SHA-256: d5865d57b4791bb0adb8abb9ec29f1a6fa486ba82ff2d0c4158a664751cc062e
font_01_sfnt_off00008205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8205 18176 bytes
SHA-256: 0e4f5fc6ff2fec7c34f7a60300b1fa14fa22cd043badad59a9fad54dc28be7cf

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