Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31e5f813a732ed6…

MALICIOUS

PDF

33.2 KB Created: 2021-07-06 15:54:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 50b41e0d16552fc0ac7aba9829bbee23 SHA-1: 1a63504aaff969df835d4bd2c2f294e2aff0f216 SHA-256: a31e5f813a732ed6d9e5738e465a054768a36bce0c0d6f0f81b461635ee404f1
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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/free-minecraft-codes-game-hack PDF link annotation
    • http://library.stembi.ac.id/repository/how-to-hack-roblox-highschool-money_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-admin-panel-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/rbxvault-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-muscle-simulator-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-clothes-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/hack-robux-roblox-hack-created-by-robuxian_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-free-scarf_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-into-peoples-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-hack-robux-online_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/esp-hack-roblox-script_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-in-roblox-without-recaptcha_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/robux-and-tix-hack-no-survey-no-download_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-mod-apk-free-download_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/no-offer-robux-hack_GM431946152.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_off000030d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D0 21400 bytes
SHA-256: 618e04526696e26530e8391927cdbabf513d06eac1162b2b21cf503a24811e26
font_01_sfnt_off00005f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F51 18172 bytes
SHA-256: 65034997240625fc9e44cd9f21ee7637befba1e18adc5d1f22f8eab3c90cf7a5

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