Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef9f333ebffccd2…

MALICIOUS

PDF

45.8 KB Created: 2021-05-16 08:12:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dc4e5dbe9633a82055eee1339e9f6d8a SHA-1: 23a73ac9b08193ae2402de862259c77d8d7abe5a SHA-256: aef9f333ebffccd2d5daca6c54c425b97edd0c47b072614beb5da2d6ffa560a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'generators' for popular games. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-cards-free-cards-game-hack, which is associated with a game hack theme. The document body, though heavily obfuscated, contains references to this URL and the game Coin Master, reinforcing the lure. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/406889139/coin-master-cards-free-cards-game-hack In PDF document text
    • http://itc-nekretnine.hr/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-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_003_off00004cec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CEC 25980 bytes
SHA-256: df69548521ccdc92e3a43a344cfc58a54ecdbf49b13cfd0db3f263a575d09445
font_01_sfnt_off00008797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8797 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off000091b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B1 17884 bytes
SHA-256: d54aa51eaaaa3e2864f0114713409e316145a0183ee6aba9be1e443db1dceb19

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