Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a671862ddb298c…

MALICIOUS

PDF

41.4 KB Created: 2021-04-25 03:51:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c98ee4969b2fe8169acb9a7c0cecfee SHA-1: 34b4559236e29600ec34e2469a224cd05ede7438 SHA-256: 36a671862ddb298c9eb673a90eef576168bf11920b933b241aa95a9fd7f78c8c
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 0.9941

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.xyz/app/431946152/roblox-player-radar-script-hack-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.xyz/app/431946152/roblox-player-radar-script-hack-game-hack PDF link annotation
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-booga-booga-admin-script-hack.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/descargar-roblox-hack-robux-para-android-2021.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/intriga-roblox-hack.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/como-ganar-robux-gratis-sin-hacks.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/robux-hack-no-verification-or-survey-2021.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/notoriety-roblox-loot-bag-cheat.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-tix-on-roblox-with-cheat-engine.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-earn-free-robux-2021.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hacked-noob-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-chat-hacks-pastebin.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_off0000420a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x420A 26164 bytes
SHA-256: 6d6d7f0475e21faa66d77ec8b22952b30c66dd68ae60a0d14eec75e15428cae7
font_01_sfnt_off00007d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6C 19092 bytes
SHA-256: 20fc2727072efad0d93c66a7a9da3479ec010065fe7589cb98a0ae1e11c9ef19

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