Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f07f7e897640471…

MALICIOUS

PDF

40.3 KB Created: 2021-04-29 00:35:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8415177e75697e0e8f1b6dde5a656c62 SHA-1: 4de6a65b826c507590590086e5914dac02334d68 SHA-256: 5f07f7e8976404718c699469b8ffe1cd7a429491aa688e856305cd060acce868
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a lure to potentially harmful content. No scripts were extracted, but the document's primary function appears to be social engineering via deceptive links.

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/are-free-robux-streams-legit-game-hack In PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/boku-no-roblox-remastered-hack-chose-quirks.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/how-to-make-a-free-robux-hack.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/how-to-hack-roblox-catalog.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/soros-italian-restaurant-free-roblox.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-shirt-template-free.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-noclip-no-cheat-engine.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/easiest-way-to-upload-audio-on-roblox-for-free-2021.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-scp-foundation-model-free.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-full-throttle-hack.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/hack-roblox-reddit.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_off00004072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4072 24916 bytes
SHA-256: e94649b339ee36602adf1ee4d7e7e801e26b1b0343d4e146d5ab7aad33ae798e
font_01_sfnt_off000079b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B1 19016 bytes
SHA-256: 888713281162defb46e622325f2a37ede85688bb8cdb40bc687c1fac322acc90