Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72d1f519c8933ed…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 07:27:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a017a2aec224121ccf596e9e1df92750 SHA-1: 3366e1b9732bfd4d2c88e6978a74b2b43cb7d215 SHA-256: a72d1f519c8933ed904f943fa7219613e5e294468994e4f6fb29894874a3bb3a
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically targeting users with promises of free game hacks or generators. The embedded URL, https://netcdn.tw/app/431946152/free-robux-no-virus-hax-free-game-hack, is flagged as malicious infrastructure. While no scripts were extracted, the document's structure and embedded links strongly suggest an attempt to trick the user into navigating to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-robux-no-virus-hax-free-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/redeem-free-robux-code_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/robux-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/como-hackear-comandos-de-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/scirpt-hack-roblox-vh2_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-hack-tool-mac_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-jailbreak-scipts_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/is-minecraft-education-edition-free_GM479516143.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
font_00_sfnt_off00005097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5097 26308 bytes
SHA-256: a6b582726026bc63152995339dd5a88449aaf6c745feb10fd2cde03bab09373b
font_01_sfnt_off00008d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8D 18496 bytes
SHA-256: 1910ce0d9a802cf80aec70ea98c0ffedff76aa743387a0aedfe4ecf623ddab48

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