Malicious PDF — malware analysis report

Static analysis result for SHA-256 0337d16517c38865…

MALICIOUS

PDF

37.2 KB Created: 2021-07-03 18:13:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 804c33caa22501f42f921ac2fd76b7c7 SHA-1: 41bca3c9d0310fa51dcd35c145b7d307a0b5a316 SHA-256: 0337d16517c38865944483c34c884b0b7bde0b789b2a3c9e6380287d01256af6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a call-to-action phrase, strongly suggesting a phishing or social engineering attempt. The ML classifier also flagged this PDF as malicious with high confidence. The primary URL, http://netcdn.tw/app/406889139/free-spin-coin-master-2021-link-game-hack, likely leads to a payload download. No scripts were extracted, but the presence of embedded URLs and the ML detection indicate a high likelihood of malicious intent.

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/free-spin-coin-master-2021-link-game-hack In PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/google-how-do-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-to-cheat-roblox-mad-city_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/roblox-what-day-is-restaurant-tycoon-2-coming-for-free_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/free-roblox-birthday-party_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-client_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/tiktok-free-auto-hearts_GM835599320.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/roblox-free-skin-maker_GM431946152.pdfIn PDF document text
    • https://puslitbang.kejaksaan.go.id/new/public/ckfinder/userfiles/files/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.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_off00003944.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3944 23200 bytes
SHA-256: 4b9d697fdf2f2c5be5146ada1530327a87f3ee43ba9f043a7d382c8ef5170b72
font_01_sfnt_off00006d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8D 18748 bytes
SHA-256: 87551c50e6d609f3c8aae9c53aca7d1ad4c281dc834da60ceb94801aa8be48ba