Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f8708141dd91a4…

MALICIOUS

PDF

33.5 KB Created: 2021-07-07 17:36:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ba8c445e77ee063f1bbce834d332fe89 SHA-1: 6cf0a17216ff3e01e9e25a6854d9b75774636bc7 SHA-256: 82f8708141dd91a488724cc66fc83dc47eb221ebd5fb96a22b35c605376f1da2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with SEO link farms. The document body and extracted URLs suggest a lure for game-related cheats and currency, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.tw/app/479516143/free-minecraft-hacks-game-hack
    • http://samavetpharm.com/userfiles/files/legitimate-coin-master-free-spins-apk_GM406889139.pdf
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-link-no-verification_GM406889139.pdf
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://samavetpharm.com/userfiles/files/coin-master-hack-dot-xyz_GM406889139.pdf
    • http://samavetpharm.com/userfiles/files/robux-generator-no-verification-2021_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/how-to-make-a-cool-free-roblox-acount_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/free-spin-today-coin-master_GM406889139.pdf
    • http://samavetpharm.com/userfiles/files/free-roblox-promo-code_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/roblox-how-to-get-free-faces-2021_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/free-livr-emerald-giveaways-roblox-direct_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/coin-master-lucky-patcher-hack_GM406889139.pdf
    • http://samavetpharm.com/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/free-items-that-are-robux-in-roblox_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/games-like-coin-master-for-free_GM406889139.pdf
    • http://samavetpharm.com/userfiles/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdf
    • http://samavetpharm.com/userfiles/files/hack-robux_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/huskybuscom-free-robux_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/free-robux-legit_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/free-2021-robux_GM431946152.pdf
    • http://samavetpharm.com/userfiles/files/free-robux-no-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f6a.bin
24083385b74091fec01f72d625bb30860897e11c079fc2bcb0ff853f5321447c
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6A 22408 bytes
font_01_sfnt_off00006102.bin
8f8fda7ec61391a8021437fea0b23093d98da4680992c9daa6c8728c6d82e4f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6102 18024 bytes