Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a7a52e0e7ff9b5…

MALICIOUS

PDF

33.3 KB Created: 2021-07-07 23:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8957f38be4a0b1321a8900d678b85285 SHA-1: c886e9a1cfee6ebb3f3862d05a747907cef461f2 SHA-256: c6a7a52e0e7ff9b5b115d8067ea3ef744268e55bcace34fa3a3a35473f27d18a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The document body and heuristic firings indicate a lure designed to trick users into visiting these sites, likely as part of a phishing or scam campaign. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.tw/app/431946152/free-robux-only-username-no-human-verification-game-hack In PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/roblox-robux-hack-generator-2021-november_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/roblox-mining-simlator-cheats_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/free-robux-giveaway-2021_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/free-roblox-cookies-2021_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/casper-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/roblox-hax_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/free-robux-hack-apk-download_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/free-roblox-gift-card-pins-2021-august_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/cuenta-de-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://samarpartners.com/new/public/ckfinder/userfiles/files/how-to-get-more-spins-on-coin-master-for-free_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_off00002d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D16 21292 bytes
SHA-256: baff6df7e0bccf5eee92b9cbae2b8601cba53c9a556a7bea6b182d71f2eb198a
font_01_sfnt_off00005bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCB 19588 bytes
SHA-256: 2aa3163e32aa61887c262fca8289404382398ed533c0aa8410485c934e17860b

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