Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e342b0efa1da81a…

MALICIOUS

PDF

45.0 KB Created: 2021-06-13 20:06:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 636201748609117f23e4fcfd1aff1388 SHA-1: 6b9528d9abb56e86872e53266c707658760b0e60 SHA-256: 5e342b0efa1da81a0f9bf44f568762304d8f5310dedaea64bb156eb9ca1d1d12
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a "Free Robux Instantly" lure, strongly suggesting a phishing or scam attempt. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely intended to direct users to malicious or deceptive websites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious intent to redirect users, potentially for credential harvesting or malware distribution.

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.co/app/431946152/free-robux-instantly-game-hack PDF link annotation
    • http://pustaka.ust.ac.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-download-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack-revealed-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/comment-hacker-un-compte-roblox-2021-fr_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-game-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-robeats-cheat_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-app-cheat-engine_GM431946152.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_003_off00004749.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4749 30564 bytes
SHA-256: e53323f3b6c27064fa05d474798c9efb5850d0d43df20aeb8950b0bc0f224d3d
font_01_sfnt_off00008cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB2 18600 bytes
SHA-256: eeb00711cf2e5591db958639ea5d908a8ba1b5c4404aa75c69e8a5349c023cb9

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