Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f45b90cd972ba7d…

MALICIOUS

PDF

34.6 KB Created: 2021-07-19 13:35:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 534cdfb9050fedafca86da933a90e70f SHA-1: aec8831947576807dac7c9a93d4712a9e88c5c1f SHA-256: 0f45b90cd972ba7db001bde2fcd5c1b1ae49ceb2a7380558e06a98ebd2eb77c7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic firing for a 'GAME_HACK_REDIRECT_LURE' pointing to the URL http://netcdn.tw/app/406889139/coin-master-free-spins-link-download-game-hack. The document body also contains this URL and other similar lures for game-related cheats, suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-link-download-game-hack PDF link annotation
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-games-that-actually-work_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
stream_002_off00002f25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F25 23500 bytes
SHA-256: 9616b668f3b35f1a9c882963c55390c5b690224a6760948502b6b6cc0cc59a3b
font_01_sfnt_off00006462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6462 18636 bytes
SHA-256: e0ee4d28e9fbd90893640acb023fdb3433a7d18e360fd79b0a1965f7934d0c46

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