Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4a78ad2a915068…

MALICIOUS

PDF

49.0 KB Created: 2021-05-17 01:32:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4cb0ce607a5c49c712bea69b6d11cf35 SHA-1: 6b91a9021f8b2a8d8b0665049b34f4f3288fec52 SHA-256: 1e4a78ad2a9150683fc0e74863028d0004dd9666eb7771dbec288d05c0d29400
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'free Robux' and game hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to malicious infrastructure. While no scripts were explicitly extracted, the nature of the links and the lure indicate a high likelihood of further malicious activity upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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/431946152/free-robux-no-verification-2021-game-hack In PDF document text
    • http://e-mailservis.cz/images/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-robux-websites-that-work_GM431946152.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/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-redeem-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/what-is-coin-master_GM406889139.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/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aa2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA2 25200 bytes
SHA-256: 165a8d78427be270b34e8b49c9f069627e6e7c17be4e48ce0b8a37082a20efa4
font_01_sfnt_off000083e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D91 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00009aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA3 19004 bytes
SHA-256: d712ae43aec968503a6d4b8ef93db90b07e4d7d9799b66e9787cf09d99ae12e2

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