Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40d250a0dcca0e7…

MALICIOUS

PDF

48.3 KB Created: 2021-06-10 17:28:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c97862a0a1fc53e958afd56c66cbb38 SHA-1: eb20df174c0d96d1fd651be4b5be3e4cf8c7f579 SHA-256: b40d250a0dcca0e70741472d363f3b62f01ead54e6d6ff9ee8fd5673584f0c60
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a call-to-action phrase, strongly suggesting a social engineering lure. The primary URL, https://netcdn.tw/app/431946152/hack-to-find-youtubers-roblox-game-hack, indicates the document is designed to trick users into downloading potentially malicious content related to game hacks. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classifier's high confidence score point towards a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-to-find-youtubers-roblox-game-hack In PDF document text
    • http://library.umla.ac.id//repository/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/pubg-uc-to-pkr_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-adopt-me-how-to-get-free-money_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-coins-free_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB0 26608 bytes
SHA-256: 9ec9f64cfb8ef5a7d872fe1fb146b0520d6f47810a493e09ede3b6045c153654
font_01_sfnt_off00008d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3A 3068 bytes
SHA-256: 3d1631ae465425a784719f207b349d9381de03ddd6a52bde557ab4716ae32236
font_02_sfnt_off000097e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E0 19048 bytes
SHA-256: 45ced69f925f5a2014f09b53ddeefc3919313bf7a1a57ceda4fd8a3c904aa512

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