Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e9a8e396cabd60…

MALICIOUS

PDF

34.4 KB Created: 2021-06-25 00:01:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fba5f229ce91d3e744f1bb9d84662f45 SHA-1: f8fc96bef55acdd2b43d733dde9dd4cab60bf4d3 SHA-256: 55e9a8e396cabd60eb1d6796ba92d461a142d77892c2e1491f0c995b13ea4144
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic firing for a 'GAME_HACK_REDIRECT_LURE' pointing to the URL http://netcdn.co/app/431946152/rs-free-robux-game-hack. The document body also contains this URL and other similar lures for game hacks and free currency. This indicates a phishing attempt to trick users into visiting a malicious site, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/rs-free-robux-game-hack PDF link annotation
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/pirates-wrath-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-hack-get-infinate-money-on-bloxburg_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-apps-info-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-coins-on-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/was-minecraft-ever-free_GM479516143.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_off0000320b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320B 22016 bytes
SHA-256: 4921d527281a8d637d72d2813468842b5f7abd6d6a96ded1217183a2beaf3e58
font_01_sfnt_off00006263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6263 18716 bytes
SHA-256: fb5d540572ec527a1d92b058809400b75190e79f61794ec26a302ef19407165c

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