Malicious PDF — malware analysis report

Static analysis result for SHA-256 18751a54ed266b70…

MALICIOUS

PDF

48.4 KB Created: 2021-06-04 03:56:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f56f2fa433cca61e83be1ca22835353e SHA-1: 16133f0dc0f0d9762694f0e39aec5ae023b0ae6b SHA-256: 18751a54ed266b70d93772db036594c56356cd9cc7816271b2d3db46a34c99f3
142 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are structured as SEO-optimized PDF slugs, suggesting a link farm. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document. The document body, though heavily obfuscated, contains a URL that aligns with the PDF_URI finding, likely serving as a lure for a malicious download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/www-robux-us-game-hack PDF link annotation
    • http://library.apsidoarjo.ac.id//repository/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-apocalypse-rising-spawn-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-spins-on-coin-master-app_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C6 26624 bytes
SHA-256: e0ed564c8c30cad71e8ae429c470fa22b465dd5d7478ee82f980ec1b3848bc6b
font_01_sfnt_off00009045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9045 2824 bytes
SHA-256: 955f67b406fbbec05d672b95b629f36b6c362c3b45d60943b9c93d3ef2276540
font_02_sfnt_off000099f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99F3 18396 bytes
SHA-256: 4c9ea76a60f642c5a6e903a615e24166436faf8ac63ffb5558478067c155318c

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