Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbdc3446d051f72…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 13:02:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1848a799087eca202b7adb1cbf70d71b SHA-1: 7148c7dd643c2c99416242a0641873cb7e95d9ef SHA-256: bdbdc3446d051f727268152a125f57c1fe88c9bb770bf3a59a4de653e2fcf260
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a link farm heuristic firing, suggesting it is designed to redirect users to malicious websites. The document body and extracted URLs indicate a lure for free Robux and game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely serving as a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-robux-clothes-roblox-game-hack
    • http://unilin21.ru/images/minecraft-hacks-18-9_GM479516143.pdf
    • http://unilin21.ru/images/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://unilin21.ru/images/www-roblox-com-free-robux_GM431946152.pdf
    • http://unilin21.ru/images/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://unilin21.ru/images/earn-points-for-free-robux_GM431946152.pdf
    • http://unilin21.ru/images/coin-master-club-hack_GM406889139.pdf
    • http://unilin21.ru/images/lua-scripting-roblox-hacks_GM431946152.pdf
    • http://unilin21.ru/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • http://unilin21.ru/images/free-roblox-intro-maker_GM431946152.pdf
    • http://unilin21.ru/images/coin-master-admin-free-spins_GM406889139.pdf
    • http://unilin21.ru/images/free-minecraft-java-edition_GM479516143.pdf
    • http://unilin21.ru/images/coin-master-hack-ios-10_GM406889139.pdf
    • http://unilin21.ru/images/free-robux-without-verification-2021_GM431946152.pdf
    • http://unilin21.ru/images/google-coin-master-free-spins_GM406889139.pdf
    • http://unilin21.ru/images/coin-master-free-spins-2021-blogspot_GM406889139.pdf
    • http://unilin21.ru/images/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://unilin21.ru/images/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://unilin21.ru/images/is-minecraft-free-on-pc_GM479516143.pdf
    • http://unilin21.ru/images/how-to-get-free-tiktok-coins_GM835599320.pdf
    • http://unilin21.ru/images/games-that-give-you-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f54.bin
e7bef0a287407f49fd2b9b9aa236b3d4adf755daeef6332f28f7cba5cc11037c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F54 26732 bytes
font_01_sfnt_off00008c94.bin
a1d18e52fe431c3fa184e800cbb116f4a676a51d8f231eb3c7a40e64f11ea3a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C94 18360 bytes