PDF malware analysis — malicious · d52dbe4d3968c8af

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 20:39:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02

MD5: 1d87d0971a0b9e9d301d528cc58afa5a SHA-1: 915eb09ec38b304acbbf3c09cb14271ac8c73754 SHA-256: d52dbe4d3968c8afbe975edeb92971acd92b7e1f563ff706148c8d7ad7085f2e

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 0.9797

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.online/app/406889139/coin-master-hack-online-generator-game-hack PDF link annotation
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-real-working_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-things-on-roblox_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00004f45.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F45	24652 bytes
SHA-256: `1e9d34daf33442dbe4624c3fee91e03165f0b55affd63fcb73ea76633969ce75`
`font_01_sfnt_off00008821.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8821	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off000091d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x91D3	17788 bytes
SHA-256: `f10d9d7ac26b37aa9393865027a0ede53c5b0e24a5f9161d6938870a0e29fed8`

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