Malicious PDF — malware analysis report

Static analysis result for SHA-256 a571fb49a6649462…

MALICIOUS

PDF

40.8 KB Created: 2021-04-23 19:41:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1d9ea27555c6e85e0317eeb9e9982dc SHA-1: 1ab29584e2f59de95c0b94144470afa7e3d1c3f9 SHA-256: a571fb49a6649462ca4509c7d14a88a5ad81b9ed14e88a2584c65fea959a9716
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://netsecure.top/app/431946152/how-to-hack-roblox-players-acounts-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/how-to-hack-roblox-players-acounts-game-hack PDF link annotation
    • https://sitecontabil.com.br/ckfinder/userfiles/files/robux-kaufen-free.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-2021-roblox-accounts.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-mod-menu-for-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-powergrip-gauntlet-in-parkour-roblox-free.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-do-a-roblox-hack.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-shinobi-life-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/money-cheat-retail-tycoon-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hacking-roblox-thumbnail.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/unlimited-jump-hack-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-robux-promo-codes-wiki.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_off00004240.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4240 24896 bytes
SHA-256: 770e04cd918e299589bd2c23686e64128ba1203accf9e3b7e6364885c87d068c
font_01_sfnt_off00007ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA6 18924 bytes
SHA-256: dc75c3e190026a534d97c4611bca817d875ea2aa1160e8c78cbd4b5a914f26c1