Malicious PDF — malware analysis report

Static analysis result for SHA-256 4922a461ded3a28a…

MALICIOUS

PDF

40.1 KB Created: 2021-05-24 02:19:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6dca00809170f36e163d0fe7404ff28b SHA-1: 93e7805085266ccacc031eba05ad31445000f80d SHA-256: 4922a461ded3a28a0318617d98d1d12149fed10eabe4620514a70740b8a41a5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The document body and embedded links promote free Roblox accounts and Robux, a common phishing tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector chain designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8018

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-roblox-accounts-with-robux-that-work-not-banned-game-hack In PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/pubg-uc-full-form_GM1330123889.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.sses.com.sa/uploaded_files/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34AC 25224 bytes
SHA-256: 1d430d34091ae5f6271858439e0d360cc0296a255bfc65b37a95daaa2fb08699
font_01_sfnt_off00006e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5C 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00007887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7887 19248 bytes
SHA-256: efa3c9b2c8f55d2ce8a78f8ae751aa117ac14b1934403b15023fd1527a527783

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