Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58596d6cad5af44…

MALICIOUS

PDF

44.0 KB Created: 2021-05-13 17:14:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5d6ccb36bfcb57b2a438c440916cfd0d SHA-1: 97299640dde50ce633da3ece0c2733e139df537f SHA-256: c58596d6cad5af44bfcb03cb54791b13d13717dc26a4701ad817ad546f1b3cd3
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.xyz/app/406889139/how-do-you-get-free-food-in-coin-master-game-hack PDF link annotation
    • https://www.brainpads.com/images/www-rubux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/getrobux-now_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004667.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4667 25400 bytes
SHA-256: 011f6a08c24a1fe6c80765b6dd01f158ec55c8486f2753668c55d629688613aa
font_01_sfnt_off00007eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB5 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8866 18516 bytes
SHA-256: ac91f58e21dbb93fb64f3a3444140cfe582f485122f2f3fe207e1bd010819bf3

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