Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96f1c284a9364b0…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 06:58:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6321e93ae0c2138bf138c5eb319db5f5 SHA-1: 3355bd64e5ba564a7e601ab350b0f048dbaef22d SHA-256: f96f1c284a9364b043fdcf5378f3a820311ac3b3ed3750d8e685d2e19458d975
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains multiple links designed to lure users with promises of free Robux and game hacks. These links point to a known malicious redirector infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious, supporting the observed redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/free-robux-hacker-us-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-easy-hack_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
stream_004_off000052d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D1 24700 bytes
SHA-256: 9902d32836dcbe3daa992ca28019fae164a7be6dc5bffdcb822c4b2d62649863
font_01_sfnt_off00008b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B95 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9544 18600 bytes
SHA-256: be32b0f906764c1f2317decc7ac5a24a5975e1ace61028a3a9703984df87bb8b

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