Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bc36af85259f6e…

MALICIOUS

PDF

41.8 KB Created: 2021-04-27 22:54:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8abc1e443194302ae4f8b7e3f99f4ea6 SHA-1: ed503bf568943edd5cdddd57ff55d16dc48c2e30 SHA-256: c7bc36af85259f6ec66efb1fbd3a7c2c1207ec6ef81881d202d75d451a1065b3
200 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically disguised as 'game hacks' for Roblox. The document body and heuristics indicate a lure to download or access content via these links, likely leading to a second-stage payload. The presence of a password-protected archive lure suggests an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • 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.xyz/app/431946152/roblox-email-reset-hack-game-hack In PDF document text
    • http://www.saburai.ac.id/elibrary//repository/skin-hack-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/hacking-coolrichytimemax-in-roblox-youtube.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-robux-easy-2021-pc.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-obby-gives-you-free-robux-july-no-password-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-robux-on-phone-no-human-verification.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-denis-shirt-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-hair-roblox-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-a-lot-of-robux-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-play-a-game-that-cost-robux-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-hack-roblox-tycoons.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_003_off00004009.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4009 27800 bytes
SHA-256: 6d366cd8f5bd41676859d0debb2d9101395c8177d4aea1e811a66e85e800bc9b
font_01_sfnt_off00008056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 18664 bytes
SHA-256: 9d00ae105b160b8d1d5eecbe03290b03ef9b3cc3b916e3312f9d384f0527b318

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