Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ce64f9f9e0cd4b…

MALICIOUS

PDF

41.9 KB Created: 2021-06-13 20:20:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 40afb9b82953db5a4f14488e16e896c7 SHA-1: cb9f0adec30f8a8185d89f65aad5443ac724ff91 SHA-256: a8ce64f9f9e0cd4b6df631288a11825cb0276421f86a276ea5c5b2efccddb116
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one that redirects to known malicious infrastructure, disguised as a lure for game hacks and free currency. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a phishing or redirection attack. No scripts were extracted, but the document's structure and embedded links are indicative of a social engineering attempt to lead the user to a malicious site.

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 http://netcdn.co/app/431946152/free-cool-robux-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-cheat-in-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-tiktok-followers-without-human-verification-2021_GM835599320.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/shake-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/pokemon-go-x-free-download_GM1094591345.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_off00004957.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4957 24680 bytes
SHA-256: 28b98ed51c3828447a174f09aa9918134a30cc2aafc2060ef51216fd6ee17432
font_01_sfnt_off000081fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FB 18088 bytes
SHA-256: 562683b9b29f35f5ef6ba8bfd153a57df9c93c03a0b6cb6f5da74254b43d72b4

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