Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0c76d0ca3f7438…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 00:38:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8535c55df4292048b07cdcdf2fefa267 SHA-1: 66e9115553c7ae4f07bb8237c2fa6a5ed3b91636 SHA-256: aa0c76d0ca3f743848018f02290007a8de7f9badbf9cb4c90d0e3218bab0c06d
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

Heuristics 5

  • 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.
  • 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.
  • 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.tw/app/406889139/free-coin-and-spin-for-coin-master-game-hack PDF link annotation
    • https://zd407.com/ocean_shop1/admin/upload/files/how-to-get-bear-face-mask-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/robux-in_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/coolkid-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/online-robux-hack-no-download_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/how-to-download-roblox-on-computer-hack-tool_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/how-to-gett-free-robux_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/rbx-claim_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/roblox-free-download_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/how-to-hack-any-user-in-roblox_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/buy-for-free-roblox-builders-club-classic_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://zd407.com/ocean_shop1/admin/upload/files/coin-master-hack-mod-apk-2021-download_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
stream_002_off00003093.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3093 22524 bytes
SHA-256: 42da30a05a963e2823a8ff9697b409d489888ab1b127eb2ecb4e2840815f018c
font_01_sfnt_off000062d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 18348 bytes
SHA-256: 2e7a314d6d80049ca784104c227b58d034e2cad44d3f1c388a0c6c6e6dc8627c

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