Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6a197f77fe637a…

MALICIOUS

PDF

52.3 KB Created: 2021-06-11 02:01:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c4bea8d8e30704d2a0525523340dd986 SHA-1: bfb7ca2f2f2498e1a5140e971ed025ac39ee01d6 SHA-256: ec6a197f77fe637a63b44c4e7b09cf419a07fc69e13d31d9384449f443e3fb35
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game items, specifically 'Free Robux Hack', which redirects to a known malicious URL. This indicates a phishing or scam attempt designed to trick users into visiting a potentially harmful site. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.tw/app/431946152/free-robux-hack-no-survey-or-verification-game-hack In PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/moon-active_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-catalog-roblox-items_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-g_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-earn-robux-for-free-2021_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_004_off00005150.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5150 26864 bytes
SHA-256: 75b32d259dc92f18ecc3cd8ed5119753c8e7563291131ca3d9f7b7842f264b6b
font_01_sfnt_off00009068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9068 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00009a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A03 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA714 19064 bytes
SHA-256: fdd9a3e092883f5759e41583c4ef2a080a73a2dd9db290e2de0a849c98ea420a

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