Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bb270af1265161…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 08:54:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 955df7b2966973e546fa0a0fe7d65009 SHA-1: b4dba1dd5b9779c7d1ba093db301ceeaeb4e72f1 SHA-256: 55bb270af12651619ba41f471d6cef5f422ab59e9968fea75929de171ee22533
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 0.9865

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: https://netcdn.online/app/406889139/coin-master-332-apk-free-download-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.online/app/406889139/coin-master-332-apk-free-download-game-hack PDF link annotation
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-generate-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-tiktok-foryoupage_GM835599320.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-redeem_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-rules_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
stream_004_off000052ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AB 25200 bytes
SHA-256: 22cd89889db3243052c3e69a698fc467591b4110aedea7e697637030f84072a7
font_01_sfnt_off00008bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDA 18936 bytes
SHA-256: 826378527b29e003d3d383295d63670b99dc7beb67fbb5c5ef13eaf6391d900e

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