Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb40591661f12b80…

MALICIOUS

PDF

53.4 KB Created: 2021-06-09 05:41:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 63fc5583cb3e971a213f3088517ddb07 SHA-1: 0a33d378e77f454577462ad53e62bba3c34d37e9 SHA-256: fb40591661f12b808e71fede29d04c6e2663c08657e02e6f275059f228194cd3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators' for popular games. The primary lure directs users to `https://netcdn.tw/app/431946152/hack-a-roblox-player-game-hack`, which is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack designed to lead users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9577

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/hack-a-roblox-player-game-hack In PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-today-no-verification_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-how-to-february-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-giveaway-live-now-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/alfheim-online-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/raspberry-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-flood-escape-to-how-to-get-fly-hacks_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52BC 29132 bytes
SHA-256: 1c4ab27f4dd17b1053992f51813ffb3b43bde524a5b5e54cdfda1d42bc8c506e
font_01_sfnt_off00009620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9620 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off00009fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDD 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000acef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEF 18516 bytes
SHA-256: 46dbd816eb7190c3104fd76c577f60f08d0f88b55695a591b6f8b46fb04bb003

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