PDF malware analysis — malicious · 5c8d4289d2b77a1f

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 07:23:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: e6f8d620e5781c99a8e49ff199f059a8 SHA-1: 8af1098f55306f4310f5271b9fc6c38137e7d8ac SHA-256: 5c8d4289d2b77a1fe25108b8e5a4d7cc8b23c289011890bd4e5410cfcbd1b324

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are SEO-optimized PDF documents hosted on cgalgeria-dubai.com, suggesting a link farm or redirector. The primary lure appears to be 'free game hacks' and in-game currency, a common tactic for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure itself is designed to present a large number of deceptive links.

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/406889139/free-coin-master-spins-2021-game-hack PDF link annotation
- https://www.cgalgeria-dubai.com/userfiles/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-robux-code-that-work_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-pe_GM479516143.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coinmaster-spins_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-codes-for-assassin-roblox_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-robux-mac-no-survey_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_off0000306e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x306E	23168 bytes
SHA-256: `1d6ced15c43a0c6b58137d34c7e17746b948d4739d3feec75a2105291cb3a50e`
`font_01_sfnt_off00006480.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6480	18576 bytes
SHA-256: `b91ca07aeadef02c4833a5be8b217bc3af90c6c550000b8c217b6d13a7f4cb5d`

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