Malicious PDF — malware analysis report

Static analysis result for SHA-256 b409db5ec35f208e…

MALICIOUS

PDF

33.9 KB Created: 2021-07-07 16:50:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 25d25df059aa836ef27d386537843c89 SHA-1: 239ae26211843b62ff8a2511fcba2e5d06eee696 SHA-256: b409db5ec35f208e51d5d2db2850b07e410a4f86421d327b4ebc6324dbef59f5
82 Risk Score

Malware Insights

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

The PDF document contains a high-risk heuristic firing for a game hack redirect lure, directing users to a suspicious URL. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting a site that likely hosts further malicious content or exploits. The ML classifier strongly indicates maliciousness.

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.tw/app/431946152/how-can-i-get-free-robux-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/how-to-hack-roblox-2021-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-codes-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/hacks-scripts-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-a-free-shirt-on-roblox-without-bc_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-for-everyone_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/safe-mac-roblox-quto-clicker-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-onligames-like-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/robux-free-hack-2021-agust_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/noclip-hack-for-prison-liferoblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-no-spam_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-cheats-2021_GM406889139.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_off00002edd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EDD 22036 bytes
SHA-256: daf09cdf21ac7d87a45acb5ef8b2b59fe980d0fedbbce365ec84ca04c28cd0e7
font_01_sfnt_off00005f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6D 18984 bytes
SHA-256: 88d69eb3e5aacbb9415b7e9d5cab519469ee3fdfdf18acc61836835876a3bab2

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