Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b4d85a9eb53327…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 01:09:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 26a11c866905c9f6ff0595d91f5109b5 SHA-1: 55cc25318278f10c319d7b0b96e7e0031de8f92a SHA-256: c4b4d85a9eb53327b11bd8c878b160118f9429c92f555bc582b46e16a79de884
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as offers for free game currency and hacks. The primary lure is the URL http://netcdn.tw/app/406889139/free-coin-master-spins-for-today-game-hack, which is associated with malicious redirector infrastructure. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful websites.

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-coin-master-spins-for-today-game-hack In PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/pokemon-go-free-app_GM1094591345.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/robux-hacking-code_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/hack-pp-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/omfg-roblox-hack-script-nrpg_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-hacks-2021-aimbot_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-prison-life-v20-infinite-ammo-hack-2021_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-get-animation-pack-for-free-robux_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-free-body_GM431946152.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_off0000331d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x331D 22460 bytes
SHA-256: 4e9fc739aa0d290b5a1aef6722aba10c4f9c80c8b3494a0a28cf062f512237d8
font_01_sfnt_off0000654b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654B 18528 bytes
SHA-256: 7516c489b1b881653228620cc2b0dc971f4c0cc04e000053424a555de8493b8f

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