Malicious PDF — malware analysis report

Static analysis result for SHA-256 425d5e3c37921339…

MALICIOUS

PDF

51.0 KB Created: 2021-06-11 07:25:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bbc2401d301061f09c66bbcaca524139 SHA-1: d43102b4ab0b94b6e8911cb4149a5c35b9ef84a7 SHA-256: 425d5e3c37921339d80f4aa0db7eb34a9c4305b08bfbaf3c01dea081341d64e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to game hacks, directing users to a malicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector link and the document's theme strongly suggest a phishing or social engineering attack aimed at driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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 https://netcdn.tw/app/431946152/how-to-hack-games-on-roblox-rpg-rainbow-swords-rpg-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/tiktok-free-view-iphone-survey_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-a-account-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-royale-high-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/noclip-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-free-codees-legit_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000549b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x549B 25844 bytes
SHA-256: 3df7f9cea4dca3e12792d50c5efc7c84697bff52462d2a9d0095b6f0e78e79f9
font_01_sfnt_off00008fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEC 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off0000a15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA15D 19364 bytes
SHA-256: edd068e061f718dcb6109eaaa21d470e48c3f3483703ea6ea90da2768169bbce

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