Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53306d154f98404…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 01:05:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 22d5daee4c01cc32160b615d302a90ee SHA-1: d23604fb1831044bfef84b9e96c2d0222f76494a SHA-256: a53306d154f98404cae8941e171ffed3f9bc83639a16d463244075ded10c9037
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a link farm, strongly suggesting an attempt to direct users to malicious websites. The document body and extracted URLs indicate a lure related to 'free Robux', a common theme in scams. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a malicious workflow, likely involving the distribution of further malware or phishing content.

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.tw/app/431946152/hot-to-get-free-robux-2021-may-game-hack PDF link annotation
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-no-phone-number_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-from-roblox-admins-real_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-free-roming-camera_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-money-driving-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-cheat-codes-for-android_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-tool-created-by-redboyrb_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-admin-commands-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/hack-any-tycoon-roblox-win10_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-hacks-winrar_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/best-clicker-games-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51FE 27144 bytes
SHA-256: 6f2933fbdb9e9fba234e4f95fa68f8c3ea1e55ffb51b49be5a9643a7899f8b44
font_01_sfnt_off00008f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F49 19124 bytes
SHA-256: e79962fd94096a9d5ffcdcf274d601a6b36f1c811b736398bb1eadcf0ce59b33

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