Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7723ea8d34f43b…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 11:52:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d22907d63b1111a83369338a1658ef5a SHA-1: 3776e276b07c03bf0748ea8bf48837f40636cf6c SHA-256: 2a7723ea8d34f43b0afda6c91d462b4de7efb820fc648af685c9f18b875f4c2e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting "game hacks" and "generators". The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering lure designed to lead users to potentially harmful websites.

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/cmaster-club-coin-master-hack-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/offer-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pubg-uc-kodu-yazma_GM1330123889.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-without-verifying-2021_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_004_off000050d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D1 25236 bytes
SHA-256: ae90c041f294e33ea817f679bc0d7fb71be258a4b5db57c6b01fa097bf22a57e
font_01_sfnt_off00008a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A10 18348 bytes
SHA-256: 770ec93328e1c8b307bcbfea9c0f1da9416090f0471e9d56bc95ec3568114428

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