Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d85c82dd8915c78…

MALICIOUS

PDF

36.2 KB Created: 2021-07-06 02:35:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7d615202a1c07ab9369746ac4c8fff59 SHA-1: 8dc0d6fdffc0b722932b4ff86540f2ca0434b09e SHA-256: 9d85c82dd8915c786654cbdfe49f973a5ec66a65fdb24190a6b54fc082a21720
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/coin-master-hack-mod-apk-unlimited-spin-download-game-hack PDF link annotation
    • http://library.poltekkes-palangkaraya.ac.id/repository/how-to-get-free-robux-in-5-minutes_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/how-do-you-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/free-robux-auto-redeem_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/roblox-download_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/como-hackear-cualquier-cuenta-en-roblox_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/viper-venom-fabulous-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/how-to-cheat-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/how-to-get-a-free-doge-pack-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/roblox-prison-life-hack-download_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/v3rmillion-roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/does-roblox-give-out-free-robux_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/how-to-hack-your-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.poltekkes-palangkaraya.ac.id/repository/free-roblox-gamepasses-2021-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000338c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338C 23224 bytes
SHA-256: 86f75ec8d827844e8e13ed4b17056a4749bf20f4d8f64f7bfd7a441b7822dc76
font_01_sfnt_off00006806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6806 19208 bytes
SHA-256: 168ed34bac05dcfadb60f7a37d17c2e91e9de75542f03c32a69fdbfa53a2f5ea

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