Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ded7486959a68c…

MALICIOUS

PDF

40.7 KB Created: 2021-04-23 18:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e4827a30e5fbe7bc9c7b4def35541559 SHA-1: e443506bfe79ff4ae15223714fec0df37f70bedd SHA-256: f5ded7486959a68c749e2857dcde4be24dbc63551f362413eefd4c58fd3fac37
162 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 and a password-protected-archive lure. 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 0.9941

Heuristics 6

  • 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.
  • 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
  • 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://netsecure.top/app/431946152/roblox-hack-site-robux-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://netsecure.top/app/431946152/roblox-hack-site-robux-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/how-to-download-roblox-booga-booga-hacks.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-buying-roblox-pastebin.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-infinity.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/emporor-roblox-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-vip-server-roblox-booga-booga.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-29-05-17.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-be-a-admin-in-roblox-for-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-free-robux-event.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/pastebin-free-roblox-accounts-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-rolls-on-roblox-elemental-wars.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004281.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4281 25120 bytes
SHA-256: 8f3f9bf9229714ba93829e730bc683eafd271964a1534847e0f3e0c9e734e0d8
font_01_sfnt_off00007c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7E 18544 bytes
SHA-256: dc51dbc2407b247f26a98be9a0c4b62bfed0a0971a3640a781e23f2cb77a6d7b

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