Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dad8b62f99e4d58…

MALICIOUS

PDF

46.1 KB Created: 2021-05-12 20:42:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3bdbf6db3bde74cd53bb60a751442b62 SHA-1: c8001eecd6bbc166335a197413505d1a575ba15d SHA-256: 4dad8b62f99e4d582fd825349595227ccf437f43a3167e557ce7f9d2eaf9f6a3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, that point to websites offering game hacks and free in-game items. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/479516143/is-minecraft-bedrock-edition-free-game-hack
    • https://www.tw-storage.com.tw/upload/files/weird-roblox_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/orewards-com-free-robux_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://www.tw-storage.com.tw/upload/files/websites-that-give-free-robux_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/free-ways-to-get-robux_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/free-coins-on-coin-master_GM406889139.pdf
    • https://www.tw-storage.com.tw/upload/files/coin-master-tool-hack_GM406889139.pdf
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-in-arsenal_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/roblox-how-to-get-free-clothes_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/free-robux-generator-2021_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/free-robux-hack-2021_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/free-coin-and-spin-link_GM406889139.pdf
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/who-to-get-free-robux_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-spins-2021_GM406889139.pdf
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • https://www.tw-storage.com.tw/upload/files/android-coin-master-hack-2021_GM406889139.pdf
    • https://www.tw-storage.com.tw/upload/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-spins-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004f1a.bin
403daee9b1b90e14d7e5730f99ccda1c3c7102273db3c561625d593902c501cd
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F1A 24708 bytes
font_01_sfnt_off000087cc.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
pdf-font-stream PDF embedded font (sfnt) at offset 0x87CC 2940 bytes
font_02_sfnt_off000091dc.bin
c81a05c902e5b7336ce3afe221fe42e1a1247b419ae57a3dec90c8cc8a9629c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x91DC 18268 bytes