PDF malware analysis — malicious · 650ad99d72940868

MALICIOUS

PDF

34.8 KB Created: 2021-07-01 16:58:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: a9b83febb24433479b1c8950649d53f4 SHA-1: 13fc0b06cab41251c2024e45f0680ce6458aeca2 SHA-256: 650ad99d72940868a39ca4d99f9ea25e758801e7322d1edd48263a9b7e14e8ca

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.co/app/431946152/free-avatar-animations-roblox-game-hack PDF link annotation
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-shirts-that-cost-robux-youtube_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robuxfr_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/roblox-hacks-phantom-forces-2021_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-do-you-get-free-roblox-in-youtube_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-scams_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/instant-free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/pokemon-go-free-friends_GM1094591345.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
- http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/hack-for-roblox-bee-swarm-simulator_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_off000030af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30AF	22352 bytes
SHA-256: `ad07d348c197d9092060a8081852eae7f18abeef3920321d8660a91f4a62a76b`
`font_01_sfnt_off00006267.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6267	19248 bytes
SHA-256: `ccf451f43f07e4112aabc9aa17324d6f58f2bcdf93f76eeffe3d3e3f0a177b84`

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