Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a45716db8f62f7…

MALICIOUS

PDF

43.1 KB Created: 2021-04-30 05:37:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c24f51c52c8473fc5739632e4863d545 SHA-1: 89c5d7cc3f7698249f4cc3f3de8ea8c9c36f7199 SHA-256: 35a45716db8f62f78071b318bce934e1c475e0a1f6199254254e820c29134124
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to known malicious redirector infrastructure. The document body and embedded links suggest a lure for 'free Robux' or game hacks, a common social engineering tactic. The primary malicious link is https://netcdn.xyz/app/431946152/free-robux-2021-pastebin-game-hack, which likely leads to a further payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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/free-robux-2021-pastebin-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-to-play-right-now.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-items-for-free-in-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/artmoney-robux-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-no-human-verificationcom.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-gift-card-free-codes-2021.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/hack-esp-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-coes.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-hack-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-acount-info-hack-with-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-clothes.pdfIn PDF document text
    • https://robux-rank.comIn 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_off000041a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41A7 29728 bytes
SHA-256: 5f5b776a53431c35c547d4439f0d607824234066b713c6c85af32aad4e60f612
font_01_sfnt_off000084c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C9 19024 bytes
SHA-256: 7ad180951d004a0fa51f9199bf4dd26ffc7b1a5be881b401148a75457e00c71f