Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cc87a61af60bd8…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 22:33:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 915e0011e13f87e9f2ce9b181262ae32 SHA-1: 6958af85c981aeb138ce3b2dc2bc8064d4b7233c SHA-256: d5cc87a61af60bd859ae80486f53d3c8b8b5fb77d3561e575c21fedf768e390d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body, though heavily obfuscated, contains references to the same URL. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the primary attack vector appears to be a social engineering lure to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/is-coin-master-free-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/freerubux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coin-master-spins-no-human-verification_GM406889139.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_off00004fea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEA 24196 bytes
SHA-256: 717952a84e82f23ff10ccf8442a99c7865b7626742aa572ae0979440d4fc96df
font_01_sfnt_off00008749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8749 17712 bytes
SHA-256: 22c3a497f096f7cfd0c016656a28f48d4ef3a3357dd0b23db76023e58fde53c0

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