Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d12e3c384a39741…

MALICIOUS

PDF

42.6 KB Created: 2021-06-13 22:16:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cc5b78a14fcfdb64e631edd858bb067f SHA-1: 55e31069aa052d15926d623acb9f6dee7fab3a6e SHA-256: 9d12e3c384a3974197f9b1aafddf5f2e90df813a5a751161a10c4799f22f5ed7
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external sites, many of which are hosted on mixdoors.ru and appear to be SEO-optimized PDFs related to game cheats and hacks. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with the document, likely to download further malicious content or lead them to phishing pages. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://netcdn.co/app/431946152/play-roblox-free-online-login-game-hack PDF link annotation
    • https://mixdoors.ru:443/images/roblox-free-unlimited-robux-generator_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/gabe-youtube-free-robux_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/descragr-hack-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47E6 25760 bytes
SHA-256: bb4c30e80f4debda076d963c90c49225d2523ba2ef3231d39fc7508bf3ef3acf
font_01_sfnt_off0000822e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822E 18920 bytes
SHA-256: 8c5c2c3079949bb6c2dd8996b1455f00257e9e410d50a7f600658080653ba327

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