PDF malware analysis — malicious · e3899d99f32e966a

MALICIOUS

PDF

44.7 KB Created: 2021-06-13 16:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 1029a6a9f0cbedbf7b49bc13fbcf2bb9 SHA-1: 4078fe18a015a84f266c089a6b013cde550abcfa SHA-256: e3899d99f32e966ac9195b83ad35eef3224883d5230f79d04cc3f106373ca785

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which point to SEO-optimized PDF files designed to attract users searching for free in-game currency or hacks. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads.

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 http://netcdn.co/app/431946152/keisyo-free-robux-game-hack PDF link annotation
- https://www.croydex.com/uploads/files/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/minecraft-classic-free_GM479516143.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/how-did-roblox-get-hacked_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/roblox-phantom-forces-money-hack_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/do-you-want-some-free-robux_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/installer-cheat-roblox_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/tiktok-2021-free-download_GM835599320.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/hacking-roblox-zombie_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/roblox-controversy_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/hack-robux-ios-2021_GM431946152.pdfIn PDF document text
- https://www.croydex.com/uploads/files/files/coin-master-hack-pro-gamers_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_004_off00005143.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5143	25440 bytes
SHA-256: `2a997e4bb95b9d7fb31aece792982d10c139f875997baa99bda224ff5c232ab0`
`font_01_sfnt_off00008c0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C0B	18312 bytes
SHA-256: `3073bed0005a6deb83e4e89d0015daf9a98b1b1c7886ead433107a55fac37bb0`

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