Malicious PDF — malware analysis report

Static analysis result for SHA-256 e713b94b2c96d3ec…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 08:29:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1aeec46b4fee6377fe9be9fe5f32169d SHA-1: 1e21cb897d5f88486f753393d8c2fad8ffa1ca2c SHA-256: e713b94b2c96d3ec5c64bc2abfb2cc44f6be08d86567915f6b44e779466be56e
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external PDFs, many of which are SEO-optimized and appear to be part of a link farm. One prominent link directs to a URL that masquerades as a Minecraft download, suggesting a lure for users seeking free software. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/479516143/minecraft-java-edition-download-free-game-hack PDF link annotation
    • https://www.wannon.tw/upload/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/best-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://www.wannon.tw/upload/files/apps-that-give-you-free-robux_GM431946152.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_off00004f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F91 29112 bytes
SHA-256: 396e0a4b24ccee524ce30059f9851360578af67a2061d0b3a386985d0d7b4549
font_01_sfnt_off00009072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9072 18572 bytes
SHA-256: b44bcce2d8515c0d099a66814c088ed689798a3dbc3c1364cf14b7c888151b67

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