PDF malware analysis — malicious · 23bf8e5ed83c534c

MALICIOUS

PDF

36.9 KB Created: 2021-07-01 07:20:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 373dec22ab2359d34c5bed0c5f831966 SHA-1: f96b4e90a4844eafac9cb00ab8eca5f51253d2dd SHA-256: 23bf8e5ed83c534c38769d087477381a40ac7dfff8454dfd5d6e589b30ad51ca

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on ghevanphongdep.vn and appear to be SEO-optimized pages offering hacks or free items for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests a coordinated effort to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a social engineering tactic to trick users into downloading further malware or visiting malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/406889139/how-to-get-free-chest-in-coin-master-game-hack PDF link annotation
- https://ghevanphongdep.vn/public/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/krnl-roblox_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/roblox-how-to-buy-the-gamepass-for-free_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/testing-5-ways-to-get-free-robux-it-worked_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/roblox-download-pc-windows-10-free_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/roblox-noob-vs-pro-vs-hacker_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/free-roblox-game-card-pins_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/how-to-get-a-free-unicorn-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/free-robux-2021-september-no-human-verification_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/coin-master-hack-pc_GM406889139.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/appbounty-net-free-robux_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/roblox-login-hack_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/www-roblox-cheat-us_GM431946152.pdfIn PDF document text
- https://ghevanphongdep.vn/public/upload/files/comment-hacker-quelquun-dans-roblox-qui-a-bocou-de-rebux_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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000386d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x386D	23616 bytes
SHA-256: `5a1cae18accf389d8ebaf945b2b4e4bf1f029a538b8bc990e9787ba425d9565a`
`font_01_sfnt_off00006de2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6DE2	18328 bytes
SHA-256: `5256f23430d4563f972a96d35cfee54d20d6f8c7b631d7ed4fd4b6962d092084`

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