Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cd8306a7736c2c…

MALICIOUS

PDF

44.2 KB Created: 2021-05-13 13:06:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ab7ea8e25884b9b5d08bc21953e30433 SHA-1: a12e18a5b7560966282da1eb337c0f7be3712e31 SHA-256: 82cd8306a7736c2cdd8aa4b61aab44a05d24c7653275973fb34261328387a6f8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which appear to be part of an SEO link farm. The document body and extracted URLs suggest a lure related to free spins, game hacks, or similar topics, likely intended to drive traffic to malicious or scam-related websites. No scripts were extracted from this sample.

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/406889139/free-spins-coin-master-links-blogspot-game-hack
    • https://tnupacktour.com.tw/image/data/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/how-can-i-play-minecraft-for-free_GM479516143.pdf
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-android_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/free-robux-2021-no-verification_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/free-robux-that-actually-works-2021_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-link-spin_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-8-ball-pool_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/roblox-free-robux-website_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/coin-master-apk-hack-download_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/www-coinmaster-com_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/100-hack-coin-master_GM406889139.pdf
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/roblox-arsenal-hack_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/free-minecraft-server-maker_GM479516143.pdf
    • https://tnupacktour.com.tw/image/data/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-roblox-money_GM431946152.pdf
    • https://tnupacktour.com.tw/image/data/files/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004dfd.bin
ac1f6bec0ad34575df910b3aec719f8a9df6cf7cba1a38d689b04bc52132f027
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DFD 26116 bytes
font_01_sfnt_off000089bc.bin
e19cb03e4db5dc0ff2825ab1b6cd29120edbbac4e5fd870bab1836bcb421f615
pdf-font-stream PDF embedded font (sfnt) at offset 0x89BC 18632 bytes