Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6a404bc154c62f…

MALICIOUS

PDF

55.5 KB Created: 2021-06-09 07:04:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 576f1862e1cb8c662321ecbbc806ed6c SHA-1: 1776489ec9911d3d0302b6ef5fb2089873aa705c SHA-256: 4b6a404bc154c62f49e182acaab80ed60ebe16c4127645b4bda5a5d12f2ba921
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links to websites that promise free in-game currency or cheats for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic suggests a deceptive workflow. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9649

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/roblox-free-no-sign-in-game-hack PDF link annotation
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-clothing-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-how-to-fly-hack_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5816 29564 bytes
SHA-256: cc28de32387a0bc42ac38c749369f683253c7e7ba516afe49b5d7aac3853ffc3
font_01_sfnt_off00009bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BBD 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 18356 bytes
SHA-256: e63c4550160087aa851802448422e1d166cc4524393873053887e68fb8099b9a

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