Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55fa431836b7b51…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 12:49:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5ea3ca082d5573d505c236892711d6fa SHA-1: 9f665b38402f6af0eeae4e72c71d0373b99698dc SHA-256: c55fa431836b7b5159261b510771819e0c6a6eda5307afc96dc66ae7ed369fa1
160 Risk Score

Malware Insights

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

This PDF document employs a lure for free Robux or game hacks, containing a link to a known malicious redirector. The primary malicious URL identified is http://netcdn.tw/app/431946152/rbx-free-robux-game-hack. This suggests the document is designed to redirect users to potentially harmful websites, likely for further exploitation or malware delivery.

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/431946152/rbx-free-robux-game-hack In PDF document text
    • https://digilib.darmajaya.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-mad-city-bypass-anti-cheat-script_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/who-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-get-free-robux-no-human-verification-website_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-tiktok-followers-real_GM835599320.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/murder-mystery-free-online-games-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/all-roblox-dance-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-candy-van-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/robux-hack-generator_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_off00003253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3253 22072 bytes
SHA-256: eec548c66db4f0a0b7a24c4f8e27c646adfd981bde641990481c70102793a535
font_01_sfnt_off0000634f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634F 18716 bytes
SHA-256: df5c5e0cfb8f7f2dfb35d0ecea75bc73877d40549e98d215878e07f2572b6ccc

Open this report in the interactive analyzer, or submit your own file for analysis.