Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb431f7237c2a26…

MALICIOUS

PDF

42.8 KB Created: 2021-05-14 10:00:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5dc4bd0a37f44123181f003bfc70268b SHA-1: ba3e02bbe00068f662c5edb2707502067d0df10b SHA-256: 6cb431f7237c2a26a171e9df11f75a5e905ecf13a6081ee60fe52ea6b18871ec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'free generators' and 'game hacks'. The document body and embedded links suggest a lure for users interested in obtaining in-game currency or cheats, which is a common tactic for phishing or distributing further malware. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-actually-get-free-robux-game-hack In PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/roblox-gift-card-for-free_GM431946152.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
stream_003_off00004901.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4901 25444 bytes
SHA-256: 68d055e3976d6b0a0908e346d4c6596174f1467d2a1ef1aaae08cd4bdac39edb
font_01_sfnt_off00008382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8382 18764 bytes
SHA-256: 380379838da7ba69723634981f8e24f026256aff947d3d13a6d99450b2ab0cc3

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