Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe7f89de75b87b4…

MALICIOUS

PDF

47.5 KB Created: 2021-06-04 01:37:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 21cd3f165b17c83f7f4b0a012a91e64d SHA-1: 4c1f94d377557fce7a953c0276dcbd090a7093f9 SHA-256: 3fe7f89de75b87b4441474d59a33d21fe016aefc163e7291d37ca0d8d950423a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'hacks' for popular games. The ML classifier also flagged this PDF as malicious. The embedded URLs and the heuristic firings strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/ultimate-free-spins-coin-master-game-hack In PDF document text
    • http://elibrary.perludem.org//repository/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-online-free-download_GM479516143.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
stream_004_off0000517f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517F 31980 bytes
SHA-256: 56171bd3fbfb4c6f09ce3565fd24a8590aae7fe5177a4609e5f0563759fbac51
font_01_sfnt_off00009710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9710 18408 bytes
SHA-256: 069e81d139e88509d82e8224148cc48daf359350e2997d733607192457d28ec7

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