Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5bca761b99bbb3…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 10:44:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 680c4d24c4936f726ab19d20cd744f86 SHA-1: fc734a9ac66d787195b8a62442b02b49b620519c SHA-256: ee5bca761b99bbb3ecbe6afd578fdbe7ce871574a0c530334a6adfaa244b4d32
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and cheats. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the lure of free game cheats strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially harmful sites.

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.online/app/406889139/free-coin-master-androd-cheats-2021-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000524f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x524F 25108 bytes
SHA-256: 69e5c6f81b32bd5f447cfce8c2dcbfc73a397837963bf2068a4d5ebb70d4aef0
font_01_sfnt_off00008beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEB 3380 bytes
SHA-256: cb8371cc187c45116d0984119c2893dd3db0d7f7d568d007a419406e6ca9f389
font_02_sfnt_off000097d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D8 18452 bytes
SHA-256: 61e5d8ad188eb015ddf9a5df69a65c9352fe70e06cc8ab935c42147f18f81b24

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