Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae4251a4f564607…

MALICIOUS

PDF

47.5 KB Created: 2021-06-11 00:06:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 92c72c7fb8ef3c1c523bf32b8b91e748 SHA-1: 9345683dc316b9ca7426e28ee5676cddb715fb48 SHA-256: 5ae4251a4f56460710a8f6c21f19911d39578784455c485ca2d9b7d73c3b4395
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and 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 0.9769

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
  • 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: https://netcdn.tw/app/431946152/free-robux-no-human-verification-2021-or-survey-no-scam-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 https://netcdn.tw/app/431946152/free-robux-no-human-verification-2021-or-survey-no-scam-game-hack PDF link annotation
    • http://aviaprofsoyuz.info/images/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/cache-http-freerobuxclub_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/cheat-argent-sur-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/tiktok-free-100-followers_GM835599320.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/robux-hack-v6-5_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-hack-download-android_GM406889139.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
font_00_sfnt_off00004ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EF0 25892 bytes
SHA-256: 7598eb6fbc1a8e40da278f1877f81c4dedaa5d2558091a737d46365d25d2b772
font_01_sfnt_off00008922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8922 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000092e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E4 19556 bytes
SHA-256: d42b4c85e793cd15167ff1076695174116961896737b5fdda9472de2d65ead9c

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