Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e548ef8eff5340…

MALICIOUS

PDF

40.8 KB Created: 2021-04-28 12:54:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0beb528a27948bed1dca45aa075e84bc SHA-1: 65ca5968fd51ed1315bff4181d5ad0ed691b9cb0 SHA-256: b1e548ef8eff534055db0d7183bef12eb4ee7ccedaea007320b6a7235f1e9cb2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to known malicious infrastructure. The document body and embedded links suggest a lure for "free Robux" or game hacks, likely intended to lead users to a phishing or malware download site. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/how-do-u-get-free-robux-for-roblox-game-hack In PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-aimbot-for-any-game-and-no-virus-roblox.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-guy.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-robux-100k.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/roblox-skywars-mega-vip-free-glitch.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/how-to-use-cheat-engine-66-on-roblox-2021.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/old-roblox-play-for-free.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/roblox-free-generator-no-verification.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad-real.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/how-do-you-upload-audio-to-roblox-for-free.pdfIn PDF document text
    • https://www.wearmyspex.com/uploaded_files/userfiles/files/free-roblox-accounts-may-2021.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_003_off000041ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41EA 25700 bytes
SHA-256: 8673a631bb01edbe9bd1bc26bf8ba4a3dff0e71124c53586bb44ef9ec0440cb9
font_01_sfnt_off00007c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C80 18712 bytes
SHA-256: d996c4d78c8a95e873f4d3177e407776340288b8c670731f4ed5c88f3e808545