Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a0d7a9aa122160…

MALICIOUS

PDF

35.4 KB Created: 2021-07-08 09:08:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: edfe449be7310432a88c08f4a8337485 SHA-1: 136a56b58472ae8571b9c8e16e2551f03cf150c2 SHA-256: 36a0d7a9aa122160588c08a552f423122b291138588f0adaf5e821a4237960f3
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that lead to a malicious redirector, disguised as a 'free generator' or 'game hack' lure. The primary link, http://netcdn.tw/app/431946152/free-robux-without-human-verification-2021-game-hack, is identified as a known malicious redirector. The document body and embedded URLs strongly suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

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/free-robux-without-human-verification-2021-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-rape_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/group-give-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-printable-roblox-banner_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-knife-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-generatorf_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-bit-slicer-fly-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-pe-hack-client-2021_GM479516143.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_off000030cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CC 22300 bytes
SHA-256: 37f3c51413da2e318c17a6d501920786a14944e6ba83951a73ab5d95a7263d50
font_01_sfnt_off0000623e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623E 20100 bytes
SHA-256: 224766b145fea2ee77d6018406834ac88e8b97acd6b6511a2b41135dc58ea70f

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