Malicious PDF — malware analysis report

Static analysis result for SHA-256 f347d3b31156b422…

MALICIOUS

PDF

41.5 KB Created: 2021-05-17 14:49:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 477266eb68e9c95dc0446322c9762d80 SHA-1: 35f73f592def1c1cda5176d766770fd0fbf1f99b SHA-256: f347d3b31156b4227102dc1c9a368b774fbd7094302f818b5b05b89440be19ab
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are structured as SEO link farms, suggesting a malicious intent to drive traffic to potentially harmful sites. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings of a link farm and a call-to-action phrase. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-avatar-roblox-game-hack
    • http://regioliga.pl/images/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdf
    • http://regioliga.pl/images/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://regioliga.pl/images/but-link-says-free-robux_GM431946152.pdf
    • http://regioliga.pl/images/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdf
    • http://regioliga.pl/images/blox-pink-robux-free_GM431946152.pdf
    • http://regioliga.pl/images/coin-master-tips_GM406889139.pdf
    • http://regioliga.pl/images/how-to-get-a-lot-of-robux_GM431946152.pdf
    • http://regioliga.pl/images/how-to-get-free-robux-on-pc_GM431946152.pdf
    • http://regioliga.pl/images/instant-robux_GM431946152.pdf
    • http://regioliga.pl/images/free-spins-on-coin-master_GM406889139.pdf
    • http://regioliga.pl/images/can-lucky-patcher-hack-coin-master_GM406889139.pdf
    • http://regioliga.pl/images/free-coins-coin-master-link-today_GM406889139.pdf
    • http://regioliga.pl/images/minecraft-kill-aura_GM479516143.pdf
    • http://regioliga.pl/images/hacks-minecraft_GM479516143.pdf
    • http://regioliga.pl/images/coin-master-free-spin-reward-links_GM406889139.pdf
    • http://regioliga.pl/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://regioliga.pl/images/hack-coin-master-apk-358_GM406889139.pdf
    • http://regioliga.pl/images/how-to-buy-robux-for-free_GM431946152.pdf
    • http://regioliga.pl/images/instantrobux_GM431946152.pdf
    • http://regioliga.pl/images/free-robux-no-password_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047ab.bin
08819256a615a387c51ff5993922afa6c19f68bda547ece9f413f00b6fb0977a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47AB 24424 bytes
font_01_sfnt_off00007f3e.bin
b4dd3c4f3ffdeae702bf7cab5d0e67b2e51f16692fa370b224309c32516adec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3E 18396 bytes

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