Malicious PDF — malware analysis report

Static analysis result for SHA-256 d920c5c4eef3851c…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 20:55:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1665ea67f69a2e435f01086075101ecf SHA-1: 52c13e3158b4cc90c8f15fcca463e5737cab63df SHA-256: d920c5c4eef3851cf95fe752fdfb1380db5b49b493bd525cfb31e29a0251b8d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary malicious URL identified is http://netcdn.tw/app/406889139/online-coin-master-hack-here-game-hack. This suggests a social engineering tactic to lure users to potentially malicious websites, likely for malware distribution or phishing. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a 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.tw/app/406889139/online-coin-master-hack-here-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pubg-uc-generator-no-verification_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-mod_GM431946152.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_off0000314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314C 22600 bytes
SHA-256: 92f96f382d09cc7666662209fdb9b61f9dcbee9ae6a079c9396f28cc31c6cb4b
font_01_sfnt_off000063ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AD 18080 bytes
SHA-256: 9b8e948b254d81f42744a3713bd5e57e94ce20b378f0589ec816b2d02d355b2b

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