Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a145d209d70646…

MALICIOUS

PDF

37.8 KB Created: 2021-06-18 16:45:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ec8e276f113a5b482cbcd33dbb224f55 SHA-1: 833963d344f86a7c2c578e3ddb3bfbeb7c4c5d7e SHA-256: 55a145d209d706463f8cab1fe988eab718e9af253974dcac36eca4e5337500f7
82 Risk Score

Malware Insights

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

The PDF document contains multiple links and a call-to-action phrase, directing users to websites offering 'free generators' and 'game hacks'. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate it's a lure for game-related exploits. The primary IOC is the initial redirect URL, which likely leads to a malicious download or further phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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/how-do-you-get-free-robux-on-pc-2021-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/pubg-uc-qiymeti_GM1330123889.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • https://goodtools.tw/upload/files/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/getrobux-come_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-how-to-get-free-robux-without-cheat-engine_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-robux-giveaway-live-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-robux_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_off00003924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3924 23044 bytes
SHA-256: 8bf80f78c92981b3997e15406b8709dacbe4a773181de78c584a55e64e0ffea6
font_01_sfnt_off00006ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE5 19684 bytes
SHA-256: 3e0b93530195747a66f8fce625aa84b8d0dbf9ee5300b60950da980ae29da6f2

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