Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfb5b498676a033…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 15:32:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b12abac40b063819c24edc40a97643c5 SHA-1: eb9a0affcd33c3fcc0278452b9f3ab13262753ff SHA-256: 4cfb5b498676a0330acf76bdcdacf70b7463d9b8e5dae6afe3a5abd5c4e9bf85
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and a document body that mimics a guide for obtaining in-game items, suggesting a lure for users to click on malicious links. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to host malicious content. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file, likely leading to the download of a second-stage payload.

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/how-to-get-gamepasses-using-cheat-engine-on-roblox-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-support_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/xray-hack_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/cheat-roblox-one-piece-millenium_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/where-to-type-hacking-codes-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-holiday-crown-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-fly-script-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/original-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-iphone-2021_GM406889139.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
font_00_sfnt_off000030a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A1 22188 bytes
SHA-256: b45734ead92b2b235dffbf2fec5563c4be911fe308a569cc7b1c547eb4f1191c
font_01_sfnt_off000061e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E8 19476 bytes
SHA-256: 5ecf89580ceeb5eca30ec309c518b52ccd401890eacc92e927a5b2fbb6345d90

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