Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5a285622290b3a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 09:17:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7de7fb8965205e1d0f134913e217fcde SHA-1: df070f2e987ca2e69b49bf57b154ea1d954c65c1 SHA-256: bd5a285622290b3adf97c304f05dfb25caab33f295dba83b6a0cd142508eee09
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are related to game hacks and in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and the document body's content point towards a phishing or scam attempt.

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/how-to-earn-robux-fast-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/script-hack-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/get-free-robux-by-entering-thid-birthday_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/earn-free-online-game-items-and-currencies-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/no-gravity-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-to-train-railway-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-clothes-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-make-hot-sauce-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-web-store_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/wizard-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/master-coin-hack-mod_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
font_00_sfnt_off00002f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F79 22568 bytes
SHA-256: 44a4f0e7f6a20885e2ca11bd6d0489779601eecad524d095d41f1e16c868603b
font_01_sfnt_off000061cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CF 18984 bytes
SHA-256: 5ca84e360020f2da74b1bf48c9ff4dc9eaa54ebf907e56a30fd03d2b8a30e01b

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