Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e999786c8e35c8…

MALICIOUS

PDF

23.0 KB Created: 2021-07-06 15:01:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ceb9ce5037ae5aa017398b23734daa8e SHA-1: 5f28d132fbdc190bddbbfd589f84a40f198597cf SHA-256: d7e999786c8e35c8b21234e1f2326700641dfc0d09aa8b996b2d7f612b0b80cb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a URL associated with game hacks and free currency generators. This is a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 3

  • 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.
  • 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-coins-free-game-hack In PDF document text
    • https://www.yuko.com.tw/upload/files/pokemon-go-free-account-2021_GM1094591345.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/roblox-comment-cheats_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/welcome-to-roblox-building-hack_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-get-robux-on-roblox-hack-no-offer-vid_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/redeem-roblox-card-generator-free_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-robux-hack-no-human-verification-2021-and-no-survey_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-cheat-money-in-roblox-high-school_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-robux-without-downloading-games_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/hacking-troll-2021-ultimate-driving-cars-review-roblox_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-insert-scripts-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C4 18483 bytes
SHA-256: 7c446b99df84c65fdd9fd1691e196dcdd54f18cb5e48cfd9a91aa5fce809b14f

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