Malicious PDF — malware analysis report

Static analysis result for SHA-256 593ead07eb87e34d…

MALICIOUS

PDF

53.6 KB Created: 2021-06-09 07:22:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f55c8722f548f1b6a4d22a9cd8295648 SHA-1: 555c7ddd0abed9009ee7f623c407bb88c918edaa SHA-256: 593ead07eb87e34d15a184cadfed193f018deec9ed05c626ecfdd292c03b3a3b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body referencing free Robux and Coin Master hacks, indicating a scam or phishing lure. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of external links were generated, likely to direct users to malicious or scam websites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the content strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9577

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.tw/app/431946152/how-to-get-free-robux-fast-and-easy-2021-game-hack PDF link annotation
    • http://opac.pps.uin-alauddin.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/hack-para-simulador-de-levantamento-de-peso-3-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/rcm-roblox-cheat-buddy_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-free-shirts-template_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-speed-hack-download-free_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/pubg-uc-deducted_GM1330123889.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000561f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x561F 26712 bytes
SHA-256: a814b3ea5c1917fe53777c9ea5ee6035aa9e5517650dbce4eff8e42d15966653
font_01_sfnt_off000094a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94A4 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00009e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E61 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000ab72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB72 19264 bytes
SHA-256: ff00de19120b309547e6d6cb8726af1086792e5fa66b7a4f4a49ba5bba3ff907

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