PDF malware analysis — malicious · db5e3c7dd77f2f9b

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 01:23:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 4577bae8e53c66fa203eea82ae56f6c9 SHA-1: 58b085a536276284b9fa30f83138208104b925fb SHA-256: db5e3c7dd77f2f9b46bd9c3a0d1bcab8795f19b0ebe3bde33e1f4d62400ac3c7

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

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-spins-and-coins-for-coin-master-game-game-hack PDF link annotation
- http://ellobo.com.ua/ckfinder/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-com_GM406889139.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-robux-for-free-xbox-one_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/comment-avoir-des-robux-gratuit-freerobux_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/real-robux-generator_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/youtube-how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/murder-mystery-roblox-free-knife-codes_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/wwwhacktoolcom-freedownload-roblox_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/create-your-own-roblox-game-free_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_off000030ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30AD	21684 bytes
SHA-256: `d849d1cd270ff7dab72c030307c46dd051c5f422b9d440dd9ce0072734f0e531`
`font_01_sfnt_off00006032.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6032	18608 bytes
SHA-256: `31982f023cf9e8334e0247a56239ce43a369afef10c4502d97e5781750ca878f`

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