Malicious PDF — malware analysis report

Static analysis result for SHA-256 5408ce7cfcf30347…

MALICIOUS

PDF

44.0 KB Created: 2021-06-08 23:08:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 792fe7f4fc5fd2a8a13d754e3b67ce40 SHA-1: 74ba48a749e74d649bdac49fb1c3061df1af9a1d SHA-256: 5408ce7cfcf3034794eb0e26d88038ebddc8bfa5ae59e22098c700f57492edbf
200 Risk Score

Malware Insights

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

This PDF document is designed to lure users with promises of game hacks and free items, presenting a fake CAPTCHA to trick them into interacting with malicious links. The embedded links lead to known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. The document's structure and content strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/easy-hacks-of-money-for-rocitizens-roblox-game-hack In PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-home_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/oprewards-login_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-best-hack-clients-virus-free_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/godmode-hacks-roblox_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_004_off00005037.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5037 24036 bytes
SHA-256: 3b2a3891a007bb08ef411f70bb1b28f3dc2cdad836795ed544c08d508183142f
font_01_sfnt_off000086f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F9 19028 bytes
SHA-256: baf267377c796942b5dc2ea655a8b1c29b32f7f0c27a193b50ef3ab8c97acb1a

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