Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91dbddda75d7c37…

MALICIOUS

PDF

42.2 KB Created: 2021-05-12 21:14:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ba1db29d65f88b737062d695789db59 SHA-1: 9143e775ac0857d3562a6a9e524b919ed9cd27de SHA-256: d91dbddda75d7c37db6bc7c63be71fb20cacb770a71908c686d1f03104c4a65d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The primary redirect URL is https://netcdn.xyz/app/406889139/coin-master-free-spins-cheat-deutsch-game-hack. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence suggest the document is designed to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-cheat-deutsch-game-hack In PDF document text
    • http://librarystkippgribl.com/repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/oprewards-login_GM431946152.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_003_off00004ae5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE5 24164 bytes
SHA-256: b25d6222625b515e609f2f829927ee0d9d0f34933af0fa53647011d8e5b54e50
font_01_sfnt_off00008271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8271 18360 bytes
SHA-256: 29c800506a03a3e1cb5f7ed9e4ca185df1ecbea4e67b5de69ba2e14adc8da31f

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