PDF malware analysis — malicious · b3cb6d7454d396f3

MALICIOUS

PDF

44.9 KB Created: 2021-05-11 07:21:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 878bba9e21354132fa9d1fbb62c14bd2 SHA-1: 2d62a80495561eccedbcf71d4a6be7a3761942fd SHA-256: b3cb6d7454d396f33970a90426a9fa881c911920fd673e9ea271252707ef8a86

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9632

Heuristics 4

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/all-coin-master-spin-link-and-free-download-game-hack PDF link annotation
- https://www.thecongostore.com/uploaded_files/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/minecraft-modded-client_GM479516143.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/minecraft-116-free_GM479516143.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/get-robux-com_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_003_off00004861.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4861	24812 bytes
SHA-256: `636f788a621797452f1639aa8b67c66e7a6e820c2d48b19929686e6948d14fce`
`font_01_sfnt_off000080da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x80DA	3204 bytes
SHA-256: `8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa`
`font_02_sfnt_off00008bde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8BDE	18636 bytes
SHA-256: `3cb9f3c8f4a641b227c5ed9a3eeac31d3e99f9e7e3e0f22269ab78b982e5ae7a`

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