Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a1bc5f69c5d211…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 08:44:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cfd72e14d463ae102b1b56cbe0802bf3 SHA-1: 8c2f7e5a63c0f1a49c6c72329dbc67cd1f9c2936 SHA-256: e0a1bc5f69c5d2112a0da2612a40474e9b3e1b31910012099d8145b1672f0500
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-promocodes-robux-free-game-hack PDF link annotation
    • http://library.yamasi.ac.id//repository/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/tiktok-free-food-vending-machine_GM835599320.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pubg-uc-on-discount_GM1330123889.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/robux-in_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/robux-generator_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-promo-codes-2021-october-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/pubg-uc-300_GM1330123889.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
stream_004_off00005040.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5040 25304 bytes
SHA-256: 8605726c98c1f895c021d47883fed923fa2ee9e1174990c62e777d87f0f66b1b
font_01_sfnt_off00008ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE1 18872 bytes
SHA-256: 70cdffc60095555c7db9f4479ed570642b06989588b819e16572defb2de0d791

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