Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f0bb1111be3570…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 17:08:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 126f27def4667172378c0e5a2faf4204 SHA-1: 022be361a601a4778ab81fb9ec566e4001737088 SHA-256: f8f0bb1111be3570d0d1f7afaf61063b5cfa24d2fd372cf3e1e31b9ab6451d33
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'game hacks' for popular mobile games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spins-april-2021-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs strongly suggest a social engineering tactic to trick users into visiting potentially harmful sites.

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/406889139/coin-master-free-spins-april-2021-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/start-earning-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hacking-is-bad-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-demon_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-really-worksnottttttt-youtube_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-flight_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-richest-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-robux-hack-2021-2021-working-no-password-unpatchable_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hacker-net-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-de-roblox-2021-diciembre_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/earn-5-robux-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-player-radar-hack_GM431946152.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_off00003184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3184 22896 bytes
SHA-256: e3a809fc21cf2fd959174dd2e10850596711f99f85673c88a363e19bcd2ab5e4
font_01_sfnt_off000064d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D9 18652 bytes
SHA-256: f450b6131960b2f2530361d55bff5afbccc3746f58132bfdde4257a36559d8a2

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