Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4533ef214664be…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 12:21:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bf0af2b5581388b60d68d42a519afadb SHA-1: 5b836f48d99ba4ec80178d34d7d487b742df4445 SHA-256: ff4533ef214664be50b4639f7d2b9760499adf80ffceebd49813231dc939b4bb
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The ML classifier strongly flagged this PDF as malicious. The document body and embedded URLs suggest a phishing or scam attempt to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-get-free-unlimited-robux-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/obby-gives-you-free-robux-no-password-required-2021-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-dead-winter-roblox-mac-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-promo-robux-code_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/no-key-free-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robuxian-youtube-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/download-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-bars-pc_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-website_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-combos_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/character-robux-hack-in-youtube_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-bypass-roblox-anticheat_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/ww-roblox-come_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
font_00_sfnt_off00003043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3043 22368 bytes
SHA-256: 40eb74c10051b0cc72f1420407e0f3567d620604ea1099fcb35bcfb3bf7e8e55
font_01_sfnt_off000061f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F3 19612 bytes
SHA-256: 9f90138c9e24558c53d7d73a6f9335c7ab378dcf12bc1965008c03c765cdf622

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