Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28db92cf232baa0…

MALICIOUS

PDF

33.3 KB Created: 2021-06-30 04:17:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2a466e9524a18494acd5c6bf628b0efd SHA-1: 09595f6915f432b737521369ef494b17f8fbf2b9 SHA-256: f28db92cf232baa05170525da007160fc1fe5b6a93ca543d14626202e952d3ab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and text referencing 'free Robux' and 'game hacks', designed to lure unsuspecting users. It directs users to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or downloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-hack-real-2021-game-hack In PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/bleach-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-100-robux-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/www-roblox-party-com-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/bloxland-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-scam_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-soins_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
font_00_sfnt_off00002ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CA5 21580 bytes
SHA-256: 8144dc045941c829198bfa10dcd409a0c8874cfd1eec2b8625acdbf78c57d696
font_01_sfnt_off00005c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C07 19360 bytes
SHA-256: 8c03fae37c242c4a4ed30792443b386c4c975ff60a1a3eebf1c536e24f17a35a

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