Malicious PDF — malware analysis report

Static analysis result for SHA-256 b457c27da09ceed4…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 09:00:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8cb4cdceccd7d5536c297e0496bf8be7 SHA-1: 024702b136b17c878c73e47f6c6e4c3fd7666ff6 SHA-256: b457c27da09ceed406a50ea7d218b3f01fcf76531003901c46e1773ed118b3fc
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized and appear to be part of a link farm. The document body and heuristics indicate a lure for game-related hacks and cheats, suggesting the intent is to redirect users to potentially malicious content or phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/406889139/how-to-hack-coin-master-android-game-hack PDF link annotation
    • http://perpus.masda.ac.id/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-free-accounts-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robux-codes-for-free-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-hack-club_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-2021-ios-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-cheats-for-dead-rising-2_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/https-wwwrobloxcom-games-202120216-hackedjailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/black-curls-hair-extension-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-spin-coin-master-link-download_GM406889139.pdfIn macro / runtime command snippet
    • http://perpus.masda.ac.id/repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-como-hackear-ropa_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-coins-coin-master_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
font_00_sfnt_off00003203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3203 22576 bytes
SHA-256: ba6762c9f131274e6bfe575364153c20c851e617d09643e64619f5149f4e1f9d
font_01_sfnt_off00006452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 18340 bytes
SHA-256: 8f5e1705e3e536f37138a4c71cb36c917d55f829335c91a85e3ff2e777618c3e

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