Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8183323b80d308e…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 04:17:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d8fc48d42f4cc4aca0321f979414a8b SHA-1: fe7c7c77eb18c55a11d067393499e29038176e39 SHA-256: c8183323b80d308e1b29dd424a9bbdf78bd5906bb892e844807ba66bb0ec4adc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spins-2021-app-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to drive users to potentially malicious websites, likely for credential harvesting or malware delivery.

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.tw/app/406889139/coin-master-free-spins-2021-app-game-hack In PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-codes-2021-december_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/khaos-youtube-free-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-get-free-robux-on-roblox-zephplayz_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-get-free-characters-on-roblox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-studio-how-to-add-music-for-free_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-dragon-ball-af-hacks_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/cheat-engine-roblox-bee-swarm-simulator_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-rs999-999-999-on-roblox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-hack-roblox-with-cheat-engine-for-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-candy-van-roblox-exploit_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-gift-card-codes-free-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003026.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3026 23660 bytes
SHA-256: a5ee67a12703758047ca021f8b472931a2181b2316d5a4fef68eea5ca88284a6
font_01_sfnt_off0000659d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659D 18576 bytes
SHA-256: c48ecddc58cc9103ab91fca050c766b90a1071ce7271be5da557b4f3cbe5bb61

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