Malicious PDF — malware analysis report

Static analysis result for SHA-256 525123483c4819fb…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 11:22:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d8946a84503d291102bc9e490bdf829b SHA-1: 49065fbc507ca02e8a7e2280c980da2d27e0ee36 SHA-256: 525123483c4819fbed5cb4be4de1e65ca9f77ff1405f908191fd2a7eda0f37e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically disguised as "free generator / game hack" lures. The primary redirector URL is https://netcdn.xyz/app/431946152/www-free-robux-com-game-hack, which likely leads to further malicious content or downloads. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful 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/431946152/www-free-robux-com-game-hack In PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-spins-deutsch-download-ios-link_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45B8 27760 bytes
SHA-256: 231f891fd676601b6aafe41d5a16dcf53e5d1f37ff8f895c0a9d25b785f447e6
font_01_sfnt_off0000822e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822E 18636 bytes
SHA-256: 9f7262e815bd0044d2d3715e2ef4b4760a787eb7fc9de28673ce11fb32ae2f7d

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