PDF malware analysis — malicious · 4d428b89d4e09bd4

MALICIOUS

PDF

42.3 KB Created: 2021-05-14 11:18:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 7acf410294151e94a329922f5391ad4d SHA-1: 6a57e739f9529714445aa327394124f69c91cf3f SHA-256: 4d428b89d4e09bd429cc31c73043b44a866a85a298049febc04454a5497ee6f3

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which point to other PDF files hosted on the same domain. The document body and heuristics suggest a lure related to 'Coin Master' or 'Robux' to encourage users to click these links. The ML classifier strongly indicates malicious intent, likely for SEO spam or to distribute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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/406889139/daily-free-spin-link-in-coin-master-game-hack PDF link annotation
- https://www.smarthealthme.com/uploaded_files/userfiles/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/coin-master-fan_GM406889139.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
- https://www.smarthealthme.com/uploaded_files/userfiles/files/fan-page-coin-master_GM406889139.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_003_off000049cd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x49CD	25076 bytes
SHA-256: `854ff31160ad6858c43fe0d07b383477f5baa9374a0887bf2abd063a85d61be0`
`font_01_sfnt_off00008269.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8269	18476 bytes
SHA-256: `1e8814a3a9c151bdf60a3b46a089903ecd16e44c20b3405f8f464f8da5050efe`

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