Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dac50eb1ea95db…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 11:25:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0dd78d460aa916304fa6483bfa3e0eae SHA-1: f7db5f5be9695efb5e95bc7490442374dc1428a8 SHA-256: 44dac50eb1ea95db828ce7f0e743ce0410f73c16fbceb1702cf9f0f1d3c7d627
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links designed to lure users into clicking on what appears to be a game hack generator. The primary link, https://netcdn.xyz/app/406889139/hack-game-coin-master-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirection workflow, likely intended to lead users to phishing or malware download sites.

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/406889139/hack-game-coin-master-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-hack-me_GM431946152.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_off00004930.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4930 24468 bytes
SHA-256: 03eb87238eaf3da3c2ffdd57b5f43533f15002e7c45b9331bd3ec6b1027e342f
font_01_sfnt_off00008106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8106 17976 bytes
SHA-256: c3aba157755e6a0d5120dc2640c0f2b2d2d3e911b40ce180ffdd05c08da36b6c

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