Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdda5a3820b62e72…

MALICIOUS

PDF

33.4 KB Created: 2021-06-19 09:20:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c77a53dbf3ec8be921a235c46f1993d2 SHA-1: 7efa9b5ee54f4e36d577c3e87c528851ad1614f4 SHA-256: cdda5a3820b62e729321a61e4e4ff5c2deb1fb1a40c8c672a60a88624cbe5593
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a malicious domain, masquerading as a 'free generator' or 'free Robux' lure. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow. No scripts were extracted, but the document's structure and embedded links suggest it's designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/claim-your-free-roblox-card-game-hack In PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-robux-gift-codes_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/roblox-pastebin-free-robux_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-spin-coin-master-game_GM406889139.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_off00002e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0E 21280 bytes
SHA-256: 7f035202f554c81b4bb6e15930b44447da2cc9e1f7d31a3960ee8f56a99ecb40
font_01_sfnt_off00005c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C63 19504 bytes
SHA-256: b8e90d5f9f87d9eb82825556dbe4d1c558407748267290ea9e32f78c77d1024e

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