Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e9117bdb17b5db…

MALICIOUS

PDF

46.4 KB Created: 2021-06-08 17:13:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2b3f25ffb79a0633a2b43aebaef193ad SHA-1: 8542a9226212c6b6722f1bb883d250224dd32f61 SHA-256: 53e9117bdb17b5db0cb059e14bbbfb7f364ac7ad97fc24d196cbb8c9b9fe4331
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially malicious content related to game hacks and cheats. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/viper-venom-roblox-hacks-game-hack PDF link annotation
    • http://repository.ummy.ac.id//repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/archivo-para-poner-a-roblox-para-hackear_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/pokemon-go-free-qr-code_GM1094591345.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D2 27588 bytes
SHA-256: 2b352b74b19a09fb81f9127766dc3a1297ff1678f5ae052923b29ffd0b2ef1a2
font_01_sfnt_off0000913f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x913F 18872 bytes
SHA-256: 24c195d9f4de1ef4c130f1d330705307db2031b5aa28e2edac20cee5783f33c6

Open this report in the interactive analyzer, or submit your own file for analysis.