Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b5d827333a8d50…

MALICIOUS

PDF

44.1 KB Created: 2021-06-09 16:14:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b0f5f22cd61e97381abb30465826fe1c SHA-1: 41e37c681c3555878ff9592c76a7b2f4cefcfada SHA-256: b6b5d827333a8d50329c70650cb2aca47c0cacfd4c641de12eda275787a9044a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as game hacks and free generators. It also presents a fake CAPTCHA or human verification prompt to trick users into interacting further. The document's content and embedded links strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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/roblox-free-noob-outfits-game-hack In PDF document text
    • http://librarysenior.com/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-helment-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-free-builders-club-generator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/tiktok-free-update_GM835599320.pdfIn PDF document text
    • http://librarysenior.com//repository/www-robux-com_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-daily-bonus_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF3 26128 bytes
SHA-256: d5ad3b5c2144bf52b5cc0e6004943a381484ebd69513a3a72c398e08014fc055
font_01_sfnt_off000089af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AF 18312 bytes
SHA-256: e8405bca2b757abd0851e29f40cb9357199283f4fc327a1a1517627c33b3fd3f

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