PDF malware analysis — malicious · ef0efd8f4345ea13

MALICIOUS

PDF

44.3 KB Created: 2021-05-12 16:02:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 49dfdd0eda5fc3248ea15472a67a17be SHA-1: 3b7db69b5918d7f7c114c928f2532db69b04c962 SHA-256: ef0efd8f4345ea13d64225ba5326a291bbe4bbfb2589a974ca951e7e8a6fc43f

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to attract users with promises of free game items like Robux and Coin Master spins. The ML classifier and PDF heuristics strongly indicate malicious intent, likely to direct users to phishing or malware-distributing websites. No scripts were extracted, but the extensive use of external links suggests a phishing or content-luring attack pattern.

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 https://netcdn.xyz/app/431946152/free-robux-hack-game-hack
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-heaven-free-spins-today_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-get-free-robux-app_GM431946152.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/roblox-hacked-com-2021_GM431946152.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-coin-master-spins-blog_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-free-spins-link-today-instagram_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-minecraft-java-edition_GM479516143.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/get-free-coin-master_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/is-minecraft-realms-free_GM479516143.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-spin-hack-link_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-coin-master-coins-and-spins_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-do-you-hack-roblox_GM431946152.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-spins-coin-master-october-17-2021_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-free-spins-hack-apk-download_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-hack-xyz-download-free_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-free-spin-link-new_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/actual-free-robux_GM431946152.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-claim-free-spins_GM406889139.pdf
- https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
- https://www.nrzroblox.com
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off0000504f.bin` `5a62d7f25b4e8c976d435bc90c403ff6e2c31a3aac96a4a0ab506100e2632f3f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x504F	25516 bytes
`font_01_sfnt_off00008a81.bin` `8090616d8a5c0701bec53dfbbcc7430816d9db69864bd7c9067c717eb12c26b4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A81	18412 bytes

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