PDF malware analysis — malicious · 971a435070eb97ac

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 12:38:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: 4dcc610c5b17cf103379bae5a9b14bd5 SHA-1: 9e725a3ef021708270cc7c470118416172e5a724 SHA-256: 971a435070eb97ace012e7e1a1cf0791f90c8e9ffc79d6950102e72a42cf8226

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains a large number of external links, many pointing to SEO-optimized PDF files hosted on eisgroupme.com, suggesting a link farm or content-spinning operation. The primary redirect URL, http://netcdn.tw/app/431946152/free-robux-without-human-verification-real-game-hack, is likely the entry point to a malicious download or scam page.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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.
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/free-robux-without-human-verification-real-game-hack PDF link annotation
- https://www.eisgroupme.com/uploaded_files/userfiles/files/roblox-how-to-hack-with-ceat-engine_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/como-descargar-hacks-para-roblox-booga-booga_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/robux-has-hit-10million-users-free-robux_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/cant-hacking-to-pokes-acount-in-roblox_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/hack-tower-battle-roblox_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/roblox-com-hack_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/roblox-free-slime-wings_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/roblox-how-to-add-a-thumbnail-for-free_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/pubg-uc-malaysia-murah_GM1330123889.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/adopt-me-roblox-hack-gui-trolling_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/pokemon-go-free-account-generator_GM1094591345.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/mobile-hacks-for-free-roblox_GM431946152.pdfIn PDF document text
- https://www.eisgroupme.com/uploaded_files/userfiles/files/hacks-para-counter-blox-roblox-offensive-en-espaol_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_off0000335f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x335F	22180 bytes
SHA-256: `8e4dfc065622b90b73cbe9687dec8b45eb9f369c8a11ce4aec21594d6557156c`
`font_01_sfnt_off00006489.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6489	19772 bytes
SHA-256: `fc568478bc399a77401a6ddd4d7c7c349cb7de37f92cd72754d4c54c01944b1d`

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