PDF malware analysis — malicious · 94bc584d63357eff

MALICIOUS

PDF

50.2 KB Created: 2021-06-11 05:25:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 5639ff39af378b4d7c3d8fb524d931f6 SHA-1: a9d26ae60d2821c68a6b1e4d99180ec12733d75d SHA-256: 94bc584d63357effd25bf6a2f69c392fe591514b3a0d8d316c99ef686b332963

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 0.9789

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-roblox-noclip-exploit-game-hack PDF link annotation
- https://www.wessexandrology.com/uploads/files/files/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/cheat-money-roblox-tycoon-fr_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/free-minecraft-coins_GM479516143.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/pubg-for-uc-free_GM1330123889.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/hack-anyones-roblox-account-2021_GM431946152.pdfIn PDF document text
- https://www.wessexandrology.com/uploads/files/files/roblox-hack_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_off00005543.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5543	26960 bytes
SHA-256: `e12f8904226881c0ac24b4a5849a0ea5a30e9b37c435b20a8b2e12e5c8f2da10`
`font_01_sfnt_off00009463.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9463	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off0000a175.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA175	18348 bytes
SHA-256: `1f25e98aa6e8870ee51541f09ada9937ad6239163006687e30df9098ce13c559`

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