PDF malware analysis — malicious · a61f4ce07283deef

MALICIOUS

PDF

45.7 KB Created: 2021-05-13 04:33:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 4ae2439171fdb8092b89eb7d7746f179 SHA-1: d998bde0471e8e9b1c47509769384ed3955665e9 SHA-256: a61f4ce07283deef4115f6ed8d3548bcf0bae8f2f98c64a5b1e00a02986543e2

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9507

Heuristics 6

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.
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.
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.xyz/app/431946152/hacked-roblox-game-game-hack PDF link annotation
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/can-i-have-robux_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/i-need-robux_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/free-robux-no-email_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/roblox-weird_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
- https://e-learning-mts-nurussaadah.com/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.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_003_off00004955.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4955	25676 bytes
SHA-256: `99a973f27873df8aff61dabecb6e36bb542e6bf281f9c6361ba7fb17f88b7ec6`
`font_01_sfnt_off000084f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x84F1	2908 bytes
SHA-256: `e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b`
`font_02_sfnt_off00008eeb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8EEB	18616 bytes
SHA-256: `43b97d228c7cd7fd1bba8da0f91b6cd3fc6d824cd96cfd86ffb9da3a0224d155`

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