Malicious PDF — malware analysis report

Static analysis result for SHA-256 81553b7f9b0a2364…

MALICIOUS

PDF

33.0 KB Created: 2021-07-03 19:20:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 239ed394392541e71198bf443dd0ce97 SHA-1: e9b1a14841d6cef7646fadbbd7b8074f1b21072d SHA-256: 81553b7f9b0a2364b374d07616e3febe4d3a8881abf072921ffc8ab94bd6b1c9
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links and a prominent external URI pointing to 'robux-hack-for-robol-game-hack', suggesting a lure for users seeking in-game advantages. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many with long titles and numeric slugs, further supporting the phishing or scam-related nature of the document. The ML classifier also strongly flagged this PDF as malicious.

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.tw/app/431946152/robux-hack-for-robol-game-hack PDF link annotation
    • https://library.itn.ac.id/perpusitn/repository/como-tener-robux-hack-2021-funcionando_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-unlimited-robux-no-hack-or-servay_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-lifetime-obc-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/redeem-roblox-gift-card-free_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/comment-hacker-le-catalogue-sur-roblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-hack-on-roblox-in-3-simple-steps-animated_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/http-roblox-hack-top_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-something-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-free-spain_GM406889139.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
font_00_sfnt_off00002f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F62 20948 bytes
SHA-256: 02785256f1d541654ac71516eb95f81b721e8140ba76c07732907eca923b1fca
font_01_sfnt_off00005cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD5 18772 bytes
SHA-256: 57bf990538076f57ccec27cf3479bccd2e9cf778f18c71870bb6a0aeeea36341

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