PDF malware analysis — malicious · 1eb83c6bd93293bf

MALICIOUS

PDF

41.4 KB Created: 2021-05-15 17:34:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: b4e68cba423ba93da681364e625f6fdc SHA-1: d67d2e32150df479a37a0a786fc386cef994d580 SHA-256: 1eb83c6bd93293bf2100a53304a8d6213707a3e1e9e48406c9255e8afd85b9c0

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 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-today-game-hack PDF link annotation
- https://kupinapopust.mk/pub/img/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/robux-online_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
- https://kupinapopust.mk/pub/img/userfiles/files/coin-master-facebook-free-spins_GM406889139.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
`stream_003_off000047db.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x47DB	24040 bytes
SHA-256: `ba3b0473b758a55383c3485db768529709d93db28829e99fede4be8b561870ba`
`font_01_sfnt_off00007eca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7ECA	18412 bytes
SHA-256: `ee277532c3187caf3da016130e4cbd3fee848ac0b1174d0f40fc16c12ed3c41d`

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