Malicious PDF — malware analysis report

Static analysis result for SHA-256 9835be74c0e3b893…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 22:06:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e40080c1849763f1be157c18d7a069cf SHA-1: 0be48c7d285da4d93d0a59b60133a910cedf73f9 SHA-256: 9835be74c0e3b89324d06aca8c27f7e726891f15eb476d2d21e2fd9afc2ad793
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector, disguised as generators for popular games like Coin Master and Roblox. The primary lure is 'Free Online Spins Coin Master', directing users to 'http://netcdn.tw/app/406889139/free-online-spins-coin-master-game-hack'. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful websites.

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/free-online-spins-coin-master-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pokemon-go-free-event_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pubg-uc-transfer_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-app-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/completed-coin-master-hack_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_off000030c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C5 22296 bytes
SHA-256: 28c1ef90dd68820bf3306f049f4650ee1e4dd6aa51ec33dfa7a83f3bdabab127
font_01_sfnt_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 18248 bytes
SHA-256: 69f566190966a66c1fe8ab6bbc8550b86d8e85ebd5e604a82219f2cafac13777

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