Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b3b4d5efd17709…

MALICIOUS

PDF

33.1 KB Created: 2021-07-19 16:45:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: de1b35c5e3999983d912ec9b7ccfa92f SHA-1: 7e523b7483d94d8d816f46c92c4c1bb4054fd9a0 SHA-256: 46b3b4d5efd177099365ebe38385aa0b3d7a0f7d3e0d859038f7d0dbc3c1a220
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising free in-game currency generators. The document body and embedded URLs suggest a lure for popular games and services, aiming to trick users into visiting these malicious sites. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/406889139/free-coins-coin-master-2021-game-hack In PDF document text
    • http://batutynas.lt/images/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://batutynas.lt/images/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://batutynas.lt/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://batutynas.lt/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://batutynas.lt/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://batutynas.lt/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://batutynas.lt/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://batutynas.lt/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://batutynas.lt/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://batutynas.lt/images/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.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_002_off00002b76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B76 23252 bytes
SHA-256: e37e751b868dc43cc96795e69f0ca89c525b496f7b7b82ad72c58449a87e64e2
font_01_sfnt_off00005ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 18112 bytes
SHA-256: 0727bd4027d3f5eec951b181c2bc31ee4d98e10eed2c862aff41d240a04f60ea

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