PDF malware analysis — malicious · c49091852c759fa7

MALICIOUS

PDF

32.9 KB Created: 2021-07-09 18:40:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 364cc484001ac9705af9c11b78b6364f SHA-1: 19dc77935ba07847ab6b509cc3a7a8d2c47a4281 SHA-256: c49091852c759fa7c31f9293b3448fb059e2bf0469ff36524fd95f4061a94d9d

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDFs, forming a link farm. The document body explicitly mentions 'Free Robux Hack No Verification' and includes a URL that likely leads to a malicious download or scam. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to trick users into downloading malware or engaging in fraudulent activities.

Machine Learning

Nyx PDF Classifier malicious score 0.9824

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.tw/app/431946152/free-robux-hack-no-verification-game-hack PDF link annotation
- https://htdvn.com/public/upload/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/roblox-hack-me_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/roblox-prison-lifev20-cheats_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-robux-generator-no-survey-d_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/free-limiteds-com-roblox_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/adopt-me-roblox-hack_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/roblox-how-to-get-a-group-for-free_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/hacks-for-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/hacks-to-the-game-on-roblox-cadet-promotion-course_GM431946152.pdfIn PDF document text
- https://htdvn.com/public/upload/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
- https://htdvn.com/public/upload/files/coin-master-hack-no-download_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
`font_00_sfnt_off00002a55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2A55	22132 bytes
SHA-256: `a358501fe552c9421032342508b045232b2e1b2c8a9ed7c17aeb019dc9c9ef23`
`font_01_sfnt_off00005b59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B59	19244 bytes
SHA-256: `96540bd7c84d60e769713d590412c745bf113fce47b0f54684cca50d2dde6ca8`

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