Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4f8ed091749818…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 08:31:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 06022a7611fad8154587a46fa27cb504 SHA-1: 3b2f170ecb3576e351606d4adceb220fec6b691d SHA-256: ee4f8ed0917498183f2d19f77ec3bf5c0e98d71fa9c86664e20235700c28b400
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as free game hacks and generators. The primary lure URL is http://netcdn.tw/app/431946152/www-free-robux-game-hack. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate malicious intent.

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/www-free-robux-game-hack In PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/fun-roblox-games-to-cheat-on_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-robux-code-that-everyone-can-use_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/roblox-free-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/roblox-retail-tycoon-money-cheat_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/forts-update-the-northern-frontier-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-games-at-roblox-download_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-tiktok-and-like_GM835599320.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/roblox-ban-account-hack_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/online-free-games-like-roblox_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_off00003090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3090 22040 bytes
SHA-256: 3ea60e055d9a17732c9bf6e0d23fe0502ae4d59fc88a37650047cd6af53bf3e0
font_01_sfnt_off00006142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 19080 bytes
SHA-256: acf5ca21e1b57f7804790e88d3c8e797014eccbd964a564fa6b8ab1e1ef3ee82

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