Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5204ad9395705f4…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 17:38:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c8deda9d45ece36f3d4ebf605d48a595 SHA-1: a0dbe6fdf0c69be068dc2beeebbc3ca9eeb3a6b8 SHA-256: c5204ad9395705f48126fc01391169dcdd54c321eee26f594b2c5be21635643e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and sites offering 'free generators' or 'hacks' for popular games, indicating a lure for users to click through. The primary redirector URL is http://netcdn.tw/app/406889139/free-spins-for-coin-masters-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spins-for-coin-masters-game-hack In PDF document text
    • http://librarystkippgribl.com/repository/how-to-get-free-coins-on-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-catalog-hack_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/add-free-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-114-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_002_off000030da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30DA 22596 bytes
SHA-256: 50f1284d34f0e929dbb4796584f25371eacb96ecd3c22513c5e497ce7a7f7788
font_01_sfnt_off00006332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6332 18176 bytes
SHA-256: 0b37b87f907bc50fa1e450587a0e1f43116f92b011bc5b47444974eee354eb2f

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