Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cea8bfcf7ea4b6…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 07:01:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 030f5f2e1cfdde7d8149844243d95a6c SHA-1: e3b3eb058c55c77a5d4f169c16e1cb8c0255873b SHA-256: 75cea8bfcf7ea4b65c6660623bcf853ee589635a97b4d2608c1774afb44b5c8f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free coins'. The primary lure URL is http://netcdn.tw/app/406889139/clean-master-free-coins-and-spins-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack designed to lead users to potentially harmful content or further malware downloads.

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/clean-master-free-coins-and-spins-game-hack In PDF document text
    • https://www.yuko.com.tw/upload/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-hack-animation-pack-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-often-pubg-uc-appointments_GM1330123889.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/roblox-ps4-free_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/youtube-greenlegocats-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/roblox-free-robux-hack-i-impress-all-your-friends_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/roblox-hack-stand-user_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/fairy-world-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/robux-giver_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/daily-coin-master-spins_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_off000031de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DE 23092 bytes
SHA-256: a60dcea96f7bdfea79d694f71a4ac3ebe741e7747afae98210849e6a461b4405
font_01_sfnt_off00006613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6613 18424 bytes
SHA-256: 422edec60c9a60eea153bffbb034d541e181a6e8f3b8dab89cf23806ccd959ba

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