Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5c40dd5912ba8c…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 16:56:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 338e9b4d8587dff9d6a83b4fc46daa72 SHA-1: 4dfed8cf64051cf02084230da60381909ba08b84 SHA-256: cd5c40dd5912ba8c1dac7ca6bd9fddee834327dfe7a08f2e9a6ee1690fd6479c
102 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs that form a link farm, likely intended to direct users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary goal appears to be tricking users into downloading further malicious payloads or visiting phishing sites.

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.tw/app/431946152/adopt-me-roblox-hacks-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/piano-keyboard-free-use-music-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-exploit-lua-scripts-cheat-engine-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-game-botter-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-wings-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/strawberry-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-roblox-with-inspect-element-no-blogspot_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-a-vip-server-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/email-scammer-claiming-to-be-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-a-free-roblox-face_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robloxcom-free-hacks_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/i-will-hack-and-not-kill-parent-fashion-roblox_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_off0000318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318F 23104 bytes
SHA-256: da7cfdd6f0f34fbef07bce5d523816a90cc576d5c3c0c59ea5504a06c6adc869
font_01_sfnt_off00006596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6596 19308 bytes
SHA-256: 22934774863ac3be514f624650c183b4034f40a3033292b7237229c7ea0ab873

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