Malicious PDF — malware analysis report

Static analysis result for SHA-256 4535b9aff3924e10…

MALICIOUS

PDF

43.1 KB Created: 2021-06-04 07:54:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fb3f48c103d2ae8e6dbd3fcdaaafc488 SHA-1: c2c3aec590c02c197f51578b03016e414c79b7e7 SHA-256: 4535b9aff3924e104accce8fba95d6c16d526ac0d5acd1933470c67670ff50b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically promoting 'Coin Master' game hacks. The document body and heuristics indicate a lure to download a file, likely a second-stage payload. While no scripts were explicitly extracted, the nature of the redirector and the lure suggests a common pattern for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/coin-master-attack-hack-game-hack In PDF document text
    • http://library.umla.ac.id/repository/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-coins-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/freespins-coin-master_GM406889139.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
stream_004_off0000500d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500D 24492 bytes
SHA-256: 43e6d976459091b618444d90e4f2258fa334a7bde1203856b265a6fd29cdd0f1
font_01_sfnt_off00008743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8743 17716 bytes
SHA-256: 70399db0e332628e5b8235b330fa983a1f520a6186e18c08c1293487a921032f

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