Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d28328885f1576…

MALICIOUS

PDF

41.5 KB Created: 2021-06-13 19:45:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f8000192a1d87746376d366911be265e SHA-1: 66908ae91c1a3c69cd27cbb183fb0a4360607288 SHA-256: 58d28328885f1576e2c6f31afa357477c84d8fd4da76455627eb01bec122650a
122 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and a call-to-action link impersonating a brand, designed to trick users into clicking through to a malicious URL. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a lure for game-related cheats or free currency, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/discord-roblox-cheat-game-hack.
  • 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/discord-roblox-cheat-game-hack PDF link annotation
    • http://korporacjaroma.pl/images/buy-robux-for-free-no-human-verification_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • http://korporacjaroma.pl/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-roblox-promoodes_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://korporacjaroma.pl/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/d-day-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/getrobux-come_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/chisel-and-bits-mod-minecraft-pe_GM479516143.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_003_off000044cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44CB 24960 bytes
SHA-256: f60c90c560fe7470e64a88d1d16578ea3c0e811120aca83d5795b156eb073ffa
font_01_sfnt_off00007e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6B 18744 bytes
SHA-256: 8529c05d0f512194a099c4ee5f6e92da08dbc328f127f21c2fd597467825defd

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