Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b9b8e0a7d0ad91…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 05:55:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 863ab4876f7d59887cc5f069644360f7 SHA-1: 214e375074aff1101f9a13f6e6ffd6dfc73c0aaa SHA-256: b3b9b8e0a7d0ad91ae412c92d385bd78f5388179d5571632c76a6095fbb9e385
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a game hack redirector, specifically for 'Coin Master Free Spins'. The document body and numerous extracted URLs reinforce this theme, pointing to various game hack and free currency lures for popular games like Roblox and Coin Master. While no scripts were extracted, the primary attack vector appears to be social engineering via a deceptive document body and embedded links, likely leading to a malicious website or further download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/406889139/coin-master-free-spins--spins-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-glitch-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-make-yourself-look-like-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-on-iphone-5_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-without-verification-and-survey_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-builders-club-2021-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-anti-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-cheatsclubroblox-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-stuff-on-roblox-catalog_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_off0000306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306D 22704 bytes
SHA-256: 0919318c77dde9fbabc794f4480f0522a9afda6dbc794a4abfdd5e6a56aa8254
font_01_sfnt_off00006313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6313 18176 bytes
SHA-256: c90cd52c690b3b1dd04b69356ad4f8db221968fb130a3d2ff71dcd50323a1a90

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