Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeca33878d3df5b…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 18:20:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5dffc61357219adcf75ce8cf4dd63630 SHA-1: b84dc3a0485320ad211e852afb3f5069c43d7898 SHA-256: cfeca33878d3df5bee955fd9114b1fb609d09c1a1eb702ba7f09cc6e523f74c8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirector URL identified is http://netcdn.tw/app/431946152/how-to-get-free-robux-without-surveys-game-hack. This indicates a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-without-surveys-game-hack In PDF document text
    • http://tasleemdubai.com/userfiles/files/hacks-fr-roblox_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/premium-software-roblox-hack_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/hide-and-seek-extreme-roblox-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/pokemon-go-free-upgrade_GM1094591345.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_off00003100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3100 22896 bytes
SHA-256: f4fe1376b899f4a10d7d2ea413858f7cf4d2ee767938ce6d0814b99b147e52b0
font_01_sfnt_off0000645e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 19760 bytes
SHA-256: 224060bfe71746c825dd67c2d9d56e7c04ac00f393a1a40fba3a75915ce09ff4

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