Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f9c016faf5fccf…

MALICIOUS

PDF

47.2 KB Created: 2021-06-11 07:36:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e23bf0fe4ec644a439694cba86dbfd36 SHA-1: 9d34ba187b65aeff80a79f2e8392a15c28dcd96c SHA-256: 13f9c016faf5fccf24d71565699521d4337ba2b8239c8cce5b5862af768330cc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures related to game hacks and free currency. The primary URL identified, 'https://netcdn.tw/app/431946152/roblox-hack-robux-2021-no-human-verification-game-hack', is associated with known malicious redirector infrastructure. While no scripts were explicitly extracted, the document body and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/roblox-hack-robux-2021-no-human-verification-game-hack In PDF document text
    • https://pustaka.widyakartika.ac.id/repository/robux-free-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-hack-download-for-free_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-be-a-hacker-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-2m_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/everything-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.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_off000055af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55AF 27948 bytes
SHA-256: 23679a41b9773807ec064bab2e2c0c64cea4bda192cf34cd0657820ce982d994
font_01_sfnt_off000092c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C0 19344 bytes
SHA-256: 16041b508231ef946d112dec09b691ae39c2ad6bf2dda2ba66ea21485f42cd2f

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