Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86bc18a1a53206e…

MALICIOUS

PDF

42.2 KB Created: 2021-05-15 22:26:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 071a0c00e6c47cb81cef36ec6408ba3d SHA-1: 14c110d6ed729a8253ecad982dfad96f8191312a SHA-256: d86bc18a1a53206e34faf58339846d084d9efcd29411ef8e0cb45ce7e9bbbf31
162 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which appear to be part of a link farm designed to attract users with lures like 'free Robux' or 'Coin Master hack'. The presence of a fake CAPTCHA heuristic suggests an attempt to trick users into further interaction. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/can-you-get-robux-for-free-game-hack PDF link annotation
    • http://sbm-nn.ru/images/coin-master-online_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/hack-to-get-free-spins-on-coin-master_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_003_off00004727.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4727 25336 bytes
SHA-256: b63498c86e986a755722de038e613d69d4383122ab2389231c2feef6ca553f2f
font_01_sfnt_off000081ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 18508 bytes
SHA-256: c061b59ab901ec7c7e5d17bc5fec7ace191fd36e08e64edc0ca642be8bf86a0e

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