Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7f8e3bf856f5b7…

MALICIOUS

PDF

41.5 KB Created: 2021-04-29 01:33:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 523119671ee4c5b0aeb9fc2508c4de56 SHA-1: 0e93bdc761e4fe5aab68f6b7a5b908c3e615e20d SHA-256: 8b7f8e3bf856f5b74ddff4f2a367ece2f4451d06ab23075d8a74b3a42e1b4289
160 Risk Score

Malware Insights

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

This PDF document contains a lure related to game hacks, specifically for Roblox, to entice users to click on embedded links. The primary link redirects to malicious infrastructure, indicating a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to potentially harmful content or further malicious downloads.

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-to-make-free-admin-game-roblox-game-hack In PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-hack-for-android-apk.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-pc-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/how-to-get-free-robux-without-a-human-verification.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-list.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-roblox-hackeado-para-pc.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-no-virus-hax-free.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-edit-money-value-cheat-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-obby-limited-time-only-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/robux-hack-no-download-or-human-verification.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-how-to-get-free-hats.pdfIn PDF document text
    • https://freerobux.cyouIn 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_off00004348.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4348 25392 bytes
SHA-256: e688658a63f0031284cc5bdf939ed44139d239bd6cf3a4cb67870802dd1a11f0
font_01_sfnt_off00007dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD2 19260 bytes
SHA-256: 6b0b21c7997f9c25b8d01e78a8fcd2c85e7afb463ffd3727288ed0c40f4356be