Malicious PDF — malware analysis report

Static analysis result for SHA-256 821fcf25b4cbae3a…

MALICIOUS

PDF

39.7 KB Created: 2021-05-24 04:43:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e620010ac06aa5d30fa107532f9c7648 SHA-1: d55977e83f2ae46171bab8b3a3b4df79fa88b016 SHA-256: 821fcf25b4cbae3a43ac9d2751076f49f489688da99a9324a3f3b3e967707097
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, disguised as "game hacks" for popular titles like Roblox and Coin Master. The document body explicitly mentions "Roblox Studio Free Robux" and "CLICK HERE TO ACCESS ROBLOX GENERATOR", reinforcing the lure. The ML classifier also flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link, leading to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/roblox-studio-free-robux-game-hack In PDF document text
    • https://www.summerland.com.tw/upload/files/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • https://www.summerland.com.tw/upload/files/roblox-script-hack_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000034d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34D1 25736 bytes
SHA-256: f9f7fc135eff60f6e06c6d1a823937cceca8bb53beb67294e0fe5eeb95aaf724
font_01_sfnt_off00006f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F50 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off000078ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78EA 18484 bytes
SHA-256: 5fdc582f30145a96e28329e80bd45567e2bf6a1df475cf6931e13f95db6331fe

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