Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b13200733827655…

MALICIOUS

PDF

41.0 KB Created: 2021-05-03 12:54:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c17fcab382e7080d469afb7c23a5badb SHA-1: 7fd452eb29fb0a1ea53af1ee5a47cfbd6d249f5b SHA-256: 5b13200733827655c053b6b9d161e03e596b63c38cc2523986960cdad1a539a1
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting 'game hacks' and 'free generators' for Roblox. The document body, though heavily obfuscated, contains references to these lures and the malicious URL. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or 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/http-hack-roblox-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-rs-free.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-hack-2021-android.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-robux-on-ipad-real.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-obby-gives-you-free-robux-july-no-password-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-speed-hack-on-roblox-no-cheat-engine.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-roblox-beanie.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hack-mot-de-passe-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-hack-add.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-glitch-2021-ios.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/2gunda-parte-del-hack-de-robux.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_off00003f85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F85 26916 bytes
SHA-256: 64f2cb8fb54f3ba2e0f99d8427ba4a851b062cadcfcd283624a9d3d9d96623f9
font_01_sfnt_off00007dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC3 18464 bytes
SHA-256: 9d919bb4e4c9359f6b8ec084f2c214b88ef331786ad3d9b388b5bad64c3244ed