Malicious PDF — malware analysis report

Static analysis result for SHA-256 902b4fab8d52af93…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 14:26:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cfc391a4222b28c24a14427456f53f27 SHA-1: 628a10ce3a92b5c9505f57eb0f6d12391e9d33b4 SHA-256: 902b4fab8d52af937c4e82e4e3db3fef0be4c3483ef42c3bd6a53eb5ba1c0c74
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, including one to a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-hack-tool-exe-game-hack, disguised as a game hack generator. This indicates a lure to download potentially malicious files or visit phishing sites. The presence of a visual download button further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/406889139/coin-master-hack-tool-exe-game-hack In PDF document text
    • http://lib.stiesultanagung.ac.id//repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/roblox-follower-bot-service-free_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/pubg-uc-100-bonus_GM1330123889.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/how-to-get-free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/hacks-para-roblox-sin-ijectores_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/roblox-studio-20-beta-download-free_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/tarjeta-hack-para-robux_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/link-for-free-coins-in-coin-master_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_002_off000031e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E8 23224 bytes
SHA-256: cfb336e704f2e479cd052830f7d403c707785a442ec5a80d007c377762fba36a
font_01_sfnt_off0000663a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663A 18288 bytes
SHA-256: e3ee3faaed3fb9d29a0c6b9af349903c436110c53a8ac78f60ee1b5bb16a55c9

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