Malicious PDF — malware analysis report

Static analysis result for SHA-256 8172ad5eb89890d3…

MALICIOUS

PDF

50.2 KB Created: 2021-04-29 01:27:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 982de11a3a5951503ae9928a2ceb4423 SHA-1: c780fb11da7e7e64c5082146a7f0317e451fedf8 SHA-256: 8172ad5eb89890d3ca1da4166b302c9877089e4f3914a8af52072543788d5363
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors disguised as game hacks and free Robux generators. The primary lure is a 'free Robux' theme, directing users to the URL https://netcdn.xyz/app/431946152/how-to-make-your-own-game-with-free-robux-2021-game-hack. This indicates a phishing or scam attempt, likely to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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-your-own-game-with-free-robux-2021-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-admin-hack-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-kick-off-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cheat-roblox-mad-city-money.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/mobile4free24com-roblox-robux-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/https-wwwrobloxcom-hacks.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-hack-accounts-apk.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-royale-high-free-vip-server.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-deathrun-hack-script.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-someone-on-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/slurp-hack-roblox-jailbreak.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_off00004427.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4427 42012 bytes
SHA-256: c1ca110004fc2b575df85bf109b7f91e340e4b24fc90b74d245a34963fa0c567
font_01_sfnt_off00009db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB6 20184 bytes
SHA-256: 8780b05ca2c2efcfa9e6fdeb555ae89abb14649bdc0871ad67890c3aecd689fa