Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb253cf63e3f5a7…

MALICIOUS

PDF

34.4 KB Created: 2021-06-30 05:45:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9cb2e5eeb9a018351b0bf812190e9928 SHA-1: bb09908edf3d5ecc2dfc2ccdff36e95eb2e83e53 SHA-256: 4cb253cf63e3f5a72d4a37162236d4a4d15e044b6a1252072a642ea38393b010
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is http://netcdn.co/app/431946152/free-card-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially harmful content.

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-card-robux-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/free-roblox-clothes-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-lumber-tycoon-hack_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-mad-city-xp-hack_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/chemise-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-knife-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-a-free-pet-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-august-16-v20-7_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/como-atravesar-paredes-en-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-cheat-codes-for-roblox_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
font_00_sfnt_off00002fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE0 22436 bytes
SHA-256: 1744ed86966921660583bd7a728c41349fd1cbe96af2a6caa8625c75edbcd00b
font_01_sfnt_off000061bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 18888 bytes
SHA-256: a30d4e0b12cdc9f963382f40b53ecfa6635b6013e4997c5efd0f3394fab07847

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