Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28be8b7a68f4f22…

MALICIOUS

PDF

34.6 KB Created: 2021-06-26 18:06:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5ee506b5e3da73cdfcb375df210a6801 SHA-1: 300da613103f15c36824761e5b5cabbe6400d543 SHA-256: a28be8b7a68f4f2260119274f3f75d6e361bb49ea91c955201cd49d84f835d97
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which are SEO-optimized and point to game-related cheats and hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, and the ML classifier flagged it as malicious. The document body and extracted URLs suggest a lure for downloading potentially unwanted or malicious software disguised as game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-roblox-catalog-heaven-games-game-hack PDF link annotation
    • http://www.vista-design.hr/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://www.vista-design.hr/files/roblox-free-script-sir-meme_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-admin-commands-roblox_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/robux-in_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://www.vista-design.hr/files/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.vista-design.hr/files/coin-master-village-3_GM406889139.pdfIn PDF document text
    • https://www.vista-design.hr/files/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • https://www.vista-design.hr/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.vista-design.hr/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://www.vista-design.hr/files/coin-master-hack-programers_GM406889139.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
font_00_sfnt_off00002f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F62 22584 bytes
SHA-256: 6bf5b3ac7511b56ec9f7f87844c01effe1df2860e73ccfa52e4ab6fc866fd2bc
font_01_sfnt_off0000620b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620B 19128 bytes
SHA-256: f6bd7aaf6695c23aec9495b5736fc9fea741c5963712d71b3bf3a2b9aa261e9a

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