Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5ea0543c4630be…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 09:13:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a0b6079944a8199378e832da1d230ee3 SHA-1: a9c333e002a903907fa1b7251d343469d7ce010f SHA-256: 3a5ea0543c4630bef1459324944a856b6f9a788ae0f931cc479ae91168f1d4df
122 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. 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.
  • 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: http://netcdn.tw/app/406889139/coin-master-guide-to-free-spins-and-rewards-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 http://netcdn.tw/app/406889139/coin-master-guide-to-free-spins-and-rewards-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/roblox-robux-generator-free-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/picture-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-got-talent-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-card-code-generator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-rich-in-roblox-accounts-with-limiteds-dump-2021-working_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-com-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-cheat-engine-bypass-sandbox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-java-edition-code-free_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F52 21928 bytes
SHA-256: 05a16c39d67e569df893ad404ae46f184cf8dd76de92c9751295d11db2af36bd
font_01_sfnt_off00005fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD1 18652 bytes
SHA-256: d7653f79f3d999234835f2a00f534472d654b5fa855fc1c5b5099d4711ddd848

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