Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f31807f571ec99…

MALICIOUS

PDF

43.6 KB Created: 2021-05-12 12:12:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f4692d01a61b2f6a36d5df6959569e14 SHA-1: aa738f9b2e05d206bf3e445956ebe9a14f113b8f SHA-256: 33f31807f571ec99c5e8f10d5d995b144829242c0d5e8bbbd53d4f7fbe443097
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting "game hacks" and "free generators" for popular games. The primary malicious URL identified is https://netcdn.xyz/app/406889139/spin-link-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/spin-link-coin-master-game-hack In PDF document text
    • http://rosbk.ro/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://rosbk.ro/images/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://rosbk.ro/images/roblox-cp_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • http://rosbk.ro/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rosbk.ro/images/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://rosbk.ro/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://rosbk.ro/images/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://rosbk.ro/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://rosbk.ro/images/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://rosbk.ro/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://rosbk.ro/images/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://rosbk.ro/images/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.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_off00004983.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4983 23660 bytes
SHA-256: 569ebbcae4fc146bf26f333bec398c5d701607866d4bafc72896bb656bd117e1
font_01_sfnt_off00007f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000088bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BC 17892 bytes
SHA-256: 36e2a9e8d5493d71a45802091441cfba4dbdcc3e1acf36cfa44a264c3c73fcb6

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