PDF malware analysis — malicious · d4ae35cb0f477186

MALICIOUS

PDF

45.1 KB Created: 2021-05-18 05:37:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 068962754b5cc84e885578fb314e2d08 SHA-1: 507abfc5fedaa114144fab5a2d37a1f9de28806c SHA-256: d4ae35cb0f4771865311f63aa205b747939bf017d91b7045cdbb21a1cd407074

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which are structured as a link farm. The document body, though partially corrupted, contains phrases like 'Free Coin Master Gift Link' and references to game hacks, suggesting a lure for users seeking in-game advantages. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a high likelihood of redirection to phishing or malware distribution sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9621

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/free-coin-master-gift-link-game-hack PDF link annotation
- http://sfera-express.ru/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
- http://sfera-express.ru/images/free-robux-easy_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
- http://sfera-express.ru/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
- http://sfera-express.ru/images/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
- http://sfera-express.ru/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
- http://sfera-express.ru/images/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
- http://sfera-express.ru/images/free-roblox-glasses_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/bux-life-free-robux_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
- http://sfera-express.ru/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
- http://sfera-express.ru/images/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
- http://sfera-express.ru/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
- http://sfera-express.ru/images/coin-master-free-coins-and-spins-app_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_003_off00004896.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4896	26448 bytes
SHA-256: `dc7d42c931f314167a1f2d6162622b404140d94e2d30cb4bc15117728cac91e4`
`font_01_sfnt_off00008505.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8505	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off00008ef0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8EF0	17880 bytes
SHA-256: `1ab37f68d76bb6673fe7e3ee425fbe9bd5389a518523b888c567f62bdf1aff93`

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