PDF malware analysis — malicious · d8aaca24f9f5f991

MALICIOUS

PDF

36.1 KB Created: 2021-06-29 05:31:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 31a83f4e5cb983e59616c90118a2ebe8 SHA-1: 218c39cf13f7dec32fa987b5f841e5f54e4f54c4 SHA-256: d8aaca24f9f5f991ae52aa798775b516e76fc7c772acdc0c58a0fcbe2a7f4954

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which are presented as download opportunities for game-related cheats and currency. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malware or lead users to phishing sites. The document body itself contains a primary URL that appears to be a lure for free Robux.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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/roblox-free-robux-games-that-work-2021-game-hack PDF link annotation
- https://www.vadai.sg/uploaded_files/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/i-was-hacked-on-roblox_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/boku-no-roblox-cheat-engine_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/roblox-memes-hack_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/roblox-legends-of-speed-hack_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/roblox-speedhack-cheat-engine_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/freerobux-hack-us_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/roblox-granny-cheats_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/roblox-retail-tycoon-cheats_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/comment-avoir-un-cheat-sur-roblox-jailbreak_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/coin-master-hack-spins-download_GM406889139.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/free-online-roblox-robux-generator_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/hack-robux-com_GM431946152.pdfIn PDF document text
- https://www.vadai.sg/uploaded_files/userfiles/files/coin-master-hack-xyz-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_off00003110.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3110	23004 bytes
SHA-256: `9e0ab65d1f8c3e65698bf01214a6ee9947ee5dd4850b42d4ebdfe42b6d79c4fc`
`font_01_sfnt_off000064e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64E3	20088 bytes
SHA-256: `fb9c9d1dce6ec4e4ab82bbaf970694cfc93cd5bd0ab6ff58384ba865f4b5a37a`

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