Malicious PDF — malware analysis report

Static analysis result for SHA-256 23144017be8b7df8…

MALICIOUS

PDF

46.7 KB Created: 2021-06-09 07:02:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f0ff271bac4612406c8083f4635f83e2 SHA-1: 30cab6db34302914e2723045f1b92dce38f795c0 SHA-256: 23144017be8b7df8f3fcc9392b8a3d058a1f9e4b3877d7dfd2e0d8c1edbb3a1e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are SEO-optimized links pointing to game-related cheats and hacks. The primary URL, 'https://netcdn.tw/app/431946152/free-roblox-virtual-items-game-hack', suggests a lure for free virtual items, a common tactic for malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, further supporting the malicious intent of directing users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/free-roblox-virtual-items-game-hack PDF link annotation
    • https://uofk.edu/images/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/five-nights-at-freddys-tycoon-on-roblox-free-online_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/how-to-get-free-stuff-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/roblox-how-to-create-a-hack_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/roblox-free-roblox-cards-no-human-verification_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/cmaster-club-coin-master-hack_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
stream_004_off00005b8d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5B8D 23900 bytes
SHA-256: 7e3e5e51e279507a7ce073308f4f8fd6ad1d6738a4266237f1e0805693dcf760
font_01_sfnt_off00009214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9214 18932 bytes
SHA-256: eb51d494c09c1ba295f35d00cbca64fb2d419f0698bc97f20e1688fc8fb59ba1

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