Malicious PDF — malware analysis report

Static analysis result for SHA-256 58af87c16698cea9…

MALICIOUS

PDF

52.1 KB Created: 2021-06-03 13:01:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 146fce48a283675769659b10dd1ba81d SHA-1: d7a911403fdcdb69857a8bcb71f7c5a5edc77db0 SHA-256: 58af87c16698cea9e33ec040b222bbd79a06fde65f48f6e06c93031331fea2c7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are structured as SEO-optimized URLs pointing to pages related to 'free Robux' or 'Coin Master' cheats. The presence of a 'visual download button' heuristic and the ML classifier's high confidence score suggest a malicious intent to direct users to potentially harmful websites. While no scripts were directly extracted, the document's structure and embedded URLs strongly indicate a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 https://netcdn.online/app/406889139/coin-master-tricks-game-hack PDF link annotation
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/real-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spins-and-coins-daily_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D1 27096 bytes
SHA-256: 9e3e20ff9f64bb714ccf09312bf804e4a457d976a6c9461c81500e67b4a0b784
font_01_sfnt_off000092fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92FC 4028 bytes
SHA-256: 6a4891da4f8b73c02e22ecd6fa566d6bb4f5f2d5575b30a343f3d3c5e0919267
font_02_sfnt_off0000a09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09F 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000aa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA8F 17716 bytes
SHA-256: 72c9dca3f555d15cf680f05a17c83eea5c84cf549c22ff1a640312a233055f15

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