Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b4426425d4c2de…

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 21:19:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0cbe8220e5e0f25d8243288afe60177c SHA-1: 6b8759b9c79e9a55cd4d9f3fdd1140ee8e8af39b SHA-256: 50b4426425d4c2de8cadc264df752cf9cfe014ea24e699c87663566ca93618c6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and generators. The document body and embedded links suggest a lure to trick users into clicking on these malicious URLs, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the presence of multiple malicious redirector links and the ML classification strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/406889139/coin-master-free-coin-and-spin-app-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/pokemon-go-free-promo-codes_GM1094591345.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53CB 26492 bytes
SHA-256: 9a6f1eb09dea96246aee5ffe89c8a2eff0e7df6cb9a98a4d18adb54f7036d63a
font_01_sfnt_off000090b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B8 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00009d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3E 18060 bytes
SHA-256: f77ee24e01944806ea28e16fd73427a54f7109e241804df06ce657d8c6d11cfb

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