Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f498d94d7a6a21…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 01:05:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 69cab32ef03907ca2c4d992c07ceb124 SHA-1: 18f4a865a04d4e8f31a4d03ec83b035984622ad9 SHA-256: f3f498d94d7a6a21940b34cf8d4043ea9a8a2ff7a2204d21f3c859692a577508
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'game hacks' and 'generators'. The primary lure URL is http://netcdn.tw/app/406889139/legit-coin-master-hack-without-verification-game-hack. This suggests the document is designed to trick users into downloading or visiting malicious sites, likely as part of a phishing or malware distribution scheme.

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.tw/app/406889139/legit-coin-master-hack-without-verification-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/what-is-e-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-weird_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-bis_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-pc-download_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
font_00_sfnt_off00003159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3159 22968 bytes
SHA-256: c80de860e401819e60262646a777002dba4ad9a829369b7729ddab983fc68a01
font_01_sfnt_off000064de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DE 18640 bytes
SHA-256: a1f22d70f852995b865d153835fabf5a0db5ca93827c35320966ba9d902e38a2

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