Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a2ee11e31cd419…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 06:09:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e32581685e2e68af895c138d67cdc3f1 SHA-1: cd3497501c0d50b3609601be5ab096d491e0082a SHA-256: 85a2ee11e31cd419bce0b6b7656142bdc0a85d9ba18874f9fcf05564ca788f5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators for popular games like Coin Master and Roblox. The embedded URLs and the heuristic firings strongly indicate a lure to trick users into visiting potentially harmful sites. No scripts were extracted from this sample, but the document's structure and content are designed to facilitate initial access via user interaction with malicious links.

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/coin-master-online-game-hack In PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-group-generator-roblox_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-robux-legally_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-hack-no-download-no-survey-no-password_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/pubg-2021-uc_GM1330123889.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-codes-toy-for-roblox_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-whatsapp-tik-tok-status-download_GM835599320.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-free-admin-icon_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002ff8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FF8 23184 bytes
SHA-256: 45a8b24d4020df9ff40c296f864f4ff3deecdd9899027e882c5449287bb9f86e
font_01_sfnt_off000063cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CF 17908 bytes
SHA-256: af885c1e563a73b21aeaf221e479e615e354be997988ec2a0c0a0c1074b1e5d5

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