Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a3be44f258cdc3…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 10:07:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 11182fe4660c4d7fd006c4e529d7c00f SHA-1: 55390d96a0ffb6d171086a11bfde004cd6593485 SHA-256: 99a3be44f258cdc34967904aea0310ee559990977544ca08c85fa81bc392abfd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appear to be game hack generators or free spin offers. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious, supporting the observed redirection behavior.

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/cmaster-club-coin-master-hack-tool-game-hack In PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/robux-cheat_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/play-minecraft-pocket-edition-for-free_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_003_off0000480a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480A 25204 bytes
SHA-256: 3aa3cebc8a198dab6611cbdd87601120f3f66e3b58fa53c495636e317a2e578c
font_01_sfnt_off000081be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 18348 bytes
SHA-256: f0efa7bd578828e228852acb28a29fd722b45bccad7fbec0beae23dba8f9565c

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