Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4175f2437e9ccd…

MALICIOUS

PDF

43.5 KB Created: 2021-06-04 03:20:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fcbaccb968acf7faae26f64e539fa05e SHA-1: 18cfb8d49cf6b8ca3c01adba0c5793d901f23d13 SHA-256: eb4175f2437e9ccd90ec3e8bf1dcaa79085633df4b1490165ad4cde9834daf8a
240 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, including a primary link identified as a malicious redirector associated with 'game hacks' and 'free generators'. The document body and heuristics suggest a lure to trick users into downloading a payload, possibly via a fake CAPTCHA or human verification prompt. No scripts were extracted, but the presence of malicious redirectors and lures indicates a high likelihood of a downloader or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack In PDF document text
    • http://library.atim.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/mcpe-download_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-inappropriate-games_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_off00004fd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD1 24236 bytes
SHA-256: c9e2659f40c4eb64b7a789d58cabe2c3c456f883e4d3e283d4bf8743e72a6979
font_01_sfnt_off00008623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8623 18644 bytes
SHA-256: 4144dbe1534d0325d37e4c6129895ddb34a2bc26123e242025982d4ceef1bd2b

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