Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac3892b1fec3bcb…

MALICIOUS

PDF

46.8 KB Created: 2021-05-11 21:39:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 856e91de1b36d553aa7e72f65256eec2 SHA-1: 4b1c1df09f928e9e3612e93ff239113fa4e69a8d SHA-256: 0ac3892b1fec3bcb3161ef8e8078ac813c6d5faf65bc93ae1eee1f3a35cb43d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'Coin Master Free Spins' and game hacks. The document body and embedded links strongly suggest a lure to a phishing or scam website. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the heuristic firings indicate malicious redirection and potential game hack lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/coin-master-free-spins-ios-2021-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/mc-hacks_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_003_off00004ec0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC0 26004 bytes
SHA-256: 80a4442cc6cc303e23aaec365bfa2e813bff282ceac8b902d57e98aca9110205
font_01_sfnt_off00008a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6C 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00009456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9456 18288 bytes
SHA-256: 2b6efa5e62152ff8c49d64075f52aeeb5d732445f14fabab56fec2f8f3dafea1

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