Malicious PDF — malware analysis report

Static analysis result for SHA-256 64394145b37e971a…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 19:00:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8116c874e033c5e7e54de0bc0ed66fd2 SHA-1: 09c0a180f6cae819edc52691ec85e66b337c08d6 SHA-256: 64394145b37e971a9bfbcc01dda42b685df82c23100fbac215721a4eaff492b0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are related to "free Robux" and game hacking, indicating a lure for users interested in such topics. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URIs suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely intended to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/roblox-free-robux-codes-game-hack PDF link annotation
    • https://admin.9credit.vn/data/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-download_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/wurst-client-18-9_GM479516143.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_003_off000046a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46A4 27920 bytes
SHA-256: 10f6ac179cb47519adc0096113d1425fbf47cd7247a0af1a0d7883b57448f911
font_01_sfnt_off000084e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E4 18260 bytes
SHA-256: 40a15a9049e9412bdd5c9a35f1903570ad5947e976b8939b833c9d7797e77bf9

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