PDF malware analysis — malicious · e806bc7f8020d82c

MALICIOUS

PDF

44.1 KB Created: 2021-06-02 15:13:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 555f26653fd8abc1b5270003c0b16d57 SHA-1: aa02b3e0f432475019e18b64cb831aeb9f4ec26d SHA-256: e806bc7f8020d82cd4913bd75bdd22d63488f4591ceae66c8a230132eafa6442

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to sites offering 'free Robux' or 'free spins'. These links are likely intended to redirect users to phishing sites or download malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 4

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.
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/431946152/free-robux-cheats-card-game-hack PDF link annotation
- https://vosco.vn/uploads/vosco.vn/files/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-2021_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-by-watching-ads_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
`stream_004_off0000503d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x503D	24464 bytes
SHA-256: `c5dfe0e22ce0cef8191e8bbc6cada8012b21702b3b79223f8b33afa56c288407`
`font_01_sfnt_off00008896.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8896	18684 bytes
SHA-256: `7ca3bc86074220a916739783ce373fd221cae792ab91e8db7c4d026c0dc189d9`

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