Malicious PDF — malware analysis report

Static analysis result for SHA-256 912d93518baedb1d…

MALICIOUS

PDF

43.5 KB Created: 2021-05-11 17:01:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f19af07bcd8139e108bae6b1824d6512 SHA-1: ad758fbe5921ee0b930c53cb06670d09921be893 SHA-256: 912d93518baedb1d9c0377e61f5f0bd620420ff680c77c0daeb919993e41f50b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free Robux' lures. The primary link, https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-human-verification-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/how-to-get-free-robux-without-human-verification-game-hack In PDF document text
    • https://hotelartskathmandu.com/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/cpbildco-robux_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47EA 26536 bytes
SHA-256: 3dc7f44037ea2bdd796812f50a3ab672384e2e9ecb2fc50fbc96e77cd0185b9e
font_01_sfnt_off0000848a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x848A 19388 bytes
SHA-256: c7994a70f951e7a274445218605a0e5dad46067da7d3a89c75279f94e76bcfde

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