Malicious PDF — malware analysis report

Static analysis result for SHA-256 4812c0ab6764f7d9…

MALICIOUS

PDF

35.7 KB Created: 2021-06-22 08:09:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 583efc795902e2b9c3a7af26bce0a57a SHA-1: 928cdddeab768969c2dea17f8be570c5314bbb59 SHA-256: 4812c0ab6764f7d9e3f4e6a665f31f854eeff373e3f83dcb159d1930794e036d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are related to game hacks and cheats, suggesting a lure for users to download malicious content. The presence of a "download button" heuristic further supports this. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the overall structure and embedded links point to a phishing or social engineering attack.

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/406889139/master-8-ball-pool-free-coins-game-hack PDF link annotation
    • http://www.nguyentraiedu.vn/cms/public/upload/files/hack-pour-tre-deban-sur-roblox_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/pokemon-go-kanto-tour-free-version_GM1094591345.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/hack-script-roblox-game-servers_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/dungeon-quest-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/how-much-pokemon-go-free-account_GM1094591345.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/asshurt-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-broken-bones-iv-hack_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-make-a-free-ad-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/roblox-hack-peoples-account-2021_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.nguyentraiedu.vn/cms/public/upload/files/free-robux-com_GM431946152.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_002_off00003202.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3202 23608 bytes
SHA-256: f7549b315d928509e8031ad2f92485f9d0ff357ba4d66acbefb7548c2e294a62
font_01_sfnt_off000067c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C3 18652 bytes
SHA-256: f1c889cea97dba01ef60a47a7e02dd9d08b14b091404207e980aea824e3c74e3