Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23dba22b1d7371c…

MALICIOUS

PDF

35.6 KB Created: 2021-06-26 02:08:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: adcb7c3a477e43ebbc743fd4c87782e4 SHA-1: d37ba8d0972b9f02af3bf2e2e077a00f030be2b4 SHA-256: c23dba22b1d7371cff33c12ae7a1bd352044e0a6ee0931fb0e62db677b621eb1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one pointing to known malicious redirector infrastructure at http://netcdn.co/app/431946152/free-2021-robux-game-hack. This lure, combined with the 'free generator / game hack' theme, strongly suggests a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.co/app/431946152/free-2021-robux-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-decals-for-roblox-pizza-place_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-wings-not-decal_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/robux-redeem_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-gear-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-wings-in-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cute-free-outfits-roblox-girl_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/pokemon-go-free-spoofer_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
font_00_sfnt_off00003343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3343 22680 bytes
SHA-256: 2f15507a7adf199edc1144d241a0f985f82dea6a8aa0d7afb59c17028c3d304a
font_01_sfnt_off00006602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6602 19116 bytes
SHA-256: af14d1fa5b4f919e14fbfd2207fee29f86c7e1258ad11836ead4aea48baef512

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