Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f1df682aa8bec5…

MALICIOUS

PDF

45.1 KB Created: 2021-05-13 09:04:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6c4e066aa638995a8a0121e5c961dba4 SHA-1: 7ecdd6ae822b32318ea4764e2e713ea53d2b226c SHA-256: 42f1df682aa8bec52f51bdd3fe302ba9ebd68bf5284a1438db2706a0c934564b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and websites offering 'free Robux' or game hacks, indicating a lure for users to click through. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the lures suggest a phishing or scam attempt, likely leading to further malicious content or downloads.

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 https://netcdn.xyz/app/431946152/free-robux-picture-game-hack In PDF document text
    • http://columbuscigar.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-free-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/master-coin-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
stream_003_off00004a53.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A53 30280 bytes
SHA-256: 7d00c17b1aa90884144fe72d99f36628bcdd3b34deccd12d2bd5ea529762ed24
font_01_sfnt_off00008dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC9 18392 bytes
SHA-256: 34b0e3a58c66b2af54b16d5c8d734c4555ce81663a4a6734022a64244545498a

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