Malicious PDF — malware analysis report

Static analysis result for SHA-256 2862eb1d9ee10f64…

MALICIOUS

PDF

45.3 KB Created: 2021-05-12 02:35:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 64d2fe83c6994c2426c146d2427216a8 SHA-1: 4b2f2f0402dc0494565e962f502658d01abbc437 SHA-256: 2862eb1d9ee10f64f0a6a1e8506fbb49c715006de424fbf6ff8acf9df97aea4d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 0.9551

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://netcdn.xyz/app/406889139/village-coin-game-hack PDF link annotation
    • http://oca.undil.tl/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FB 29412 bytes
SHA-256: 9c0aed716788f2a68dc7efa0809a170b7210089ebd2317d68639f8d4f5a309fd
font_01_sfnt_off00008595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8595 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F80 17936 bytes
SHA-256: c6aadd6bba30b78db694b71701f7af3ade86557ade0239788484cb0b421f41b7

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