Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab70a0621c403c6…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 09:08:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a91e1c1b7ccc9bac3462dac3b4a482c6 SHA-1: ac9380453b49a87dbd64178fae5b97104ba397d3 SHA-256: 3ab70a0621c403c6153c342850d09f334b890375008b482f6eb0f0e6879058f3
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 0.9832

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/431946152/free-roblox-executor-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/431946152/free-roblox-executor-game-hack PDF link annotation
    • https://www.unicor.co.th/assets/editoruploads/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hack-avatar_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/app-master_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-minecraft-accounts-2021_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
stream_004_off00005445.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5445 28004 bytes
SHA-256: 3d0702f3230cc6f7972ab4b93e40471e734496c9b1b218a95e525e15502bdac2
font_01_sfnt_off00009392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9392 18192 bytes
SHA-256: aee71e4758d3f369cf1e3ec5c54acee68a6a8a95a34d59606e1594aaec7d96dc

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