Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8171d409da272cc…

MALICIOUS

PDF

53.4 KB Created: 2021-05-17 22:53:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 33c52af137b4e43dd717278639aac9f2 SHA-1: 7e2af047031c8cfa7e7dff665925aa13427e64e5 SHA-256: e8171d409da272cc2293c676cb73a090729ec430a3a0f7d323d4bc2f8f135c31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising free game hacks and generators. The document body, though heavily obfuscated, contains references to these lures. The presence of multiple malicious redirector links and the ML classifier firing strongly indicate a malicious intent to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9017

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/479516143/minecraft-gun-games-free-game-hack In PDF document text
    • http://elsenorcafe.com.co/images/robux-game-com_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/rbx-robux_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-free-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://sigmaclient.info#2In PDF document text
    • https://flux.today#3In 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_off00004cc3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC3 26208 bytes
SHA-256: 91b6b874291e4750d57702186a1aa96ed894d5b54e71005a2c78dbb2d9e5efab
font_01_sfnt_off0000880c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880C 7936 bytes
SHA-256: 218d53b68bdddb064f6fba4be822d5b3725ed1cef1a3b42796a8dd99c4a62f4e
font_02_sfnt_off0000a136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA136 4232 bytes
SHA-256: ab6320ab342704d2c5943abfba82ed4837bf2da871c91621741fd4cfd15c6ed5
font_03_sfnt_off0000afc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC3 17968 bytes
SHA-256: 8511888cd071b31a6773fc40a7c9fa25820a04ce1c2bff2e61827af067d413dd

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