Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4554bd1dcfe3ac…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 20:55:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6d2c6fa095e6ad3da16416de8f66cc22 SHA-1: a98ae011b5e01b104502b3d39eb667f14d7a5341 SHA-256: ca4554bd1dcfe3aca22eeddcd1130cf58f6ab26bb404adedb063eb099b4b38ba
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.online/app/406889139/free-coin-master-spins-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to exploit user interest in free in-game currency or hacks, leading them to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-spins-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-scam_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-map_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/moonactive-free-spins-coin-master_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-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/earn-robux-now_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-spin-generator-tool_GM406889139.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005024.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5024 24232 bytes
SHA-256: 3af7f83dabee95bd90a8952ab666456b3d6e2544447886302c29699461553cd2
font_01_sfnt_off000087be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87BE 17884 bytes
SHA-256: dbba0adc3b1b7bb8b2e5e51fec5d28ab169e2f7a165ed2a14d616932af559aea

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