PDF malware analysis — malicious · 73bdf192e73fd38d

MALICIOUS

PDF

44.9 KB Created: 2021-06-11 01:04:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15

MD5: b9eea714f842920a1dfa3c84f2880e96 SHA-1: b2252622ac26a5615376ba2743a46ea7256e119c SHA-256: 73bdf192e73fd38d12018c30663fcb7c194971d4e5ae01669837c930fc5d9945

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are related to game hacks and cheats, indicating a link farm for potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded URLs and the document's structure suggest it's designed to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 4

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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 https://netcdn.tw/app/431946152/rbuxcheats-club-roblox-hack-game-hack PDF link annotation
- https://zustsearch.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/free-executor-roblox_GM431946152.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/robux-websites-2021_GM431946152.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/rbx-website_GM431946152.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/watch-tiktok-for-free_GM835599320.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://zustsearch.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master_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.

Filename	Kind	Source	Size
`stream_004_off000051e2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x51E2	25700 bytes
SHA-256: `23fbe00a19b14dd77e52b3e050f21afb65b0a405e171209ddfc9eb4e79315264`
`font_01_sfnt_off00008c2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C2A	18592 bytes
SHA-256: `c43d79364d0d0b117e4ff2362c6897745acaa7c874e6b19e9d081b7c17933f07`

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