Malicious PDF — malware analysis report

Static analysis result for SHA-256 c763d0945cd4e969…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 20:04:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b0f37124691d6b0e1f52889db5d78135 SHA-1: f665db5820bc381373ee07060e551e3c9515b4b0 SHA-256: c763d0945cd4e969945ed44b457ecc7feab7e97bb996eaaf299cbb3140f6b87a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a lure for a 'free generator / game hack' which redirects to a suspicious URL. This, combined with the fake CAPTCHA heuristic, suggests a social engineering attack to trick users into downloading or executing malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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 http://netcdn.tw/app/479516143/minecraft-apk-free-download-016-0-game-hack PDF link annotation
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-supreme-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-jump-hack-code_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-codes-to-get-free-stuff-2021_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-fix-roblox-studio-from-hacking_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-black-shirt-free_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/hack-robar-cuentas-de-roblox-2021-akaka_GM431946152.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-robux-rixty-codes-2021_GM431946152.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
font_00_sfnt_off00003185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3185 22040 bytes
SHA-256: 2e85cba1193602c9c4051b04b6067b6cc8df6f9a3f176b6f1e949bf02624bdbb
font_01_sfnt_off00006259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6259 19372 bytes
SHA-256: 199fc5fb5555a01dd07f1f7af865c4c0146787c368d5cdea82e8d68cb589e1c5

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