Malicious PDF — malware analysis report

Static analysis result for SHA-256 689ace3bff4bf94c…

MALICIOUS

PDF

36.1 KB Created: 2021-06-18 05:42:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 927a9770ac6a639d6775c3c7c8c89a4d SHA-1: d1c6d0f4fa650d95674993f83b5f925527c3ba1e SHA-256: 689ace3bff4bf94c922442176534e69073f49b9b39a402564e2e3c2a91559c68
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document contains numerous embedded links designed to lure users into clicking on them by promising free game currency or hacks. The links, such as 'http://netcdn.co/app/431946152/roblox-redeem-codes-free-game-hack', impersonate popular brands like Roblox and Facebook, suggesting a credential phishing or malware distribution scheme. The high number of external links and the 'game hack redirect' lure strongly indicate a malicious intent to exploit user interest in free in-game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/roblox-redeem-codes-free-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.co/app/431946152/roblox-redeem-codes-free-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacks-for-booga-booga-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-script-injector-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/download-minecraft-bedrock_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_off000034d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34D0 22820 bytes
SHA-256: 7a490eb23199d83f8e466a3ff9093413937108039d4dd7e1219c1e86fad35c18
font_01_sfnt_off000067f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F4 19084 bytes
SHA-256: e02988cae77369cb1825ba78a806570a94c1853041ebfa58191fb02ce91d5b8b

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