PDF malware analysis — malicious · 3ebef4b251a095eb

MALICIOUS

PDF

46.9 KB Created: 2021-06-11 00:25:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: e6603846f0bcc98cf46be8049c1ecb78 SHA-1: d3720a621c8b1e342e46fa8e913f243867a5eebd SHA-256: 3ebef4b251a095eb7eaf769fa9aa83228c9e8f2cdcdfea810fee859f701636ae

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 0.9769

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.tw/app/431946152/free-spam-text-for-roblox-game-hack PDF link annotation
- https://satuoblong.com/ckfinder/userfiles/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/how-to-get-the-roblox-20-body-for-free_GM431946152.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://satuoblong.com/ckfinder/userfiles/files/coin-master-gold-cards-free-2021_GM406889139.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_off00005283.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5283	24192 bytes
SHA-256: `6e1cf059c13b79f93b7a66df649ade029ef4537adaad0f7a2789f8c58c82fdd0`
`font_01_sfnt_off0000895c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x895C	2844 bytes
SHA-256: `baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a`
`font_02_sfnt_off0000931e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x931E	18716 bytes
SHA-256: `c52e3683ba5bf11fde5bbe67acb95b45baf965bc26b3ff5c187d30e1561b1508`

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