Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a91dcc5a399d3e…

MALICIOUS

PDF

41.7 KB Created: 2021-05-17 18:05:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 28e95458a16d5e8a39ccc448b8aed1f9 SHA-1: 46470410b4b49baa719f0ea6977a93f764530a06 SHA-256: 38a91dcc5a399d3eb0c272fc5525f001378612e566acc539b8ba89a5b5ed0eec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures related to game hacks and generators. The embedded URL https://netcdn.xyz/app/479516143/how-to-make-a-server-in-minecraft-java-for-free-game-hack is identified as a malicious redirector. The document body, though partially corrupted, contains similar URLs and text suggesting a scam or phishing attempt.

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/479516143/how-to-make-a-server-in-minecraft-java-for-free-game-hack In PDF document text
    • http://www.gravel.ru/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://www.gravel.ru/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.gravel.ru/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.gravel.ru/images/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/www-robux-us_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.gravel.ru/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.gravel.ru/images/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://www.gravel.ru/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.gravel.ru/images/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://www.gravel.ru/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.gravel.ru/images/robux-today_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/roblox-ban_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.gravel.ru/images/coin-master-free-stuff_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_off0000489e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x489E 24748 bytes
SHA-256: 2de3174e6af28f580393781d0d1637afaebc5230f26efdd1e3658abe410fb2c9
font_01_sfnt_off0000805d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 18324 bytes
SHA-256: 9279d0b6186d29dee92c92ea41ad607c96b6d67fd8c4a148fb7dbd95f22d9888