Malicious PDF — malware analysis report

Static analysis result for SHA-256 0420b253a445c894…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 07:55:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d73ecd205fa4ca982a5cb111b15f594f SHA-1: f242618407095d4eb8b15ffcd0ee3f2ec2ab1806 SHA-256: 0420b253a445c89450d01857ae1e020a2db2540e165393e85a42c60193e6db1a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body, though heavily corrupted, contains references to similar lures and the primary malicious URL. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of a malicious workflow involving redirection to a potentially harmful site.

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/fbchampion-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-using-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-for-real-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-lumber-tycoon-2-free-ticket_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/code-kingdoms-roblox-all-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-roblox-controlar-jugadores_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-vip-server-roblox_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
stream_002_off00003163.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3163 22768 bytes
SHA-256: 77a85b3101985939205dc79e141b77ad59d6f409e9226058274825b84dd71bad
font_01_sfnt_off0000641f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641F 18656 bytes
SHA-256: fb679c9250522cab0344be15c9898f12ed930a7de6dfe2591d59bad5f2ca43f7

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