PDF malware analysis — malicious · a1bcec593ef33fa4

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 19:21:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 42a8a833224546a53d36d441de3d491d SHA-1: 6f013479269127f6921f16a5257187356ed6c6b7 SHA-256: a1bcec593ef33fa43546587e758f52fcb23f34fd9bca8faf78ab418afb3b6359

242 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document employs a fake CAPTCHA and social engineering tactics, instructing the user to press Win+R or paste a command into a terminal. This pattern, identified as ClickFix, is designed to bypass macro restrictions and trick users into executing malicious commands. The embedded URLs suggest the document is part of a link farm intended to lure users to download potentially malicious content or further compromise their systems.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

Heuristics 7

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.
Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX

Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
ClickFix social engineering attack high SE_CLICKFIX

Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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.online/app/479516143/how-to-download-minecraft-for-free-ios-game-hack PDF link annotation
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/coin-master-60-spins_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/moon-active_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/free-robux-download_GM431946152.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
- https://e-learning.mtsdditakkalasi.com/__statics/gudangsoal/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000058ed.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x58ED	25488 bytes
SHA-256: `a4c5031e498cd951141c34b94986afafd2b8d8ce5f1844eda9c887a5a42f1f9c`
`font_01_sfnt_off00009279.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9279	2892 bytes
SHA-256: `c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4`
`font_02_sfnt_off00009c63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C63	18292 bytes
SHA-256: `6bfa7f6d06191d232a4e1dc6d24987c59b1603f32861b15c5e4613e2ba4a1bec`

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