Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8cc8012359fb94…

MALICIOUS

PDF

34.2 KB Created: 2021-06-28 18:20:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 42e5fd656dda35352a6452e106626b36 SHA-1: 9aed08f04bcfad380e27883ad62d5ee721492575 SHA-256: 1f8cc8012359fb9448995a5c71a83ad31ea0fbcccb422db1473d832eedb35eea
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that masquerade as generators for in-game currency and hacks, aiming to trick users into downloading malicious content. The heuristic firings, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, strongly indicate malicious intent. The document body itself contains references to these lures and the authoring application suggests it was generated programmatically to host these links.

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.co/app/431946152/creator-hack-script-roblox-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-fly-on-skyward-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-no-waiting_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox-one-punch-man_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/tiktok-free-pro-app-download_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-exploiting_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-instantly-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-in-roblox-freeee-worksss-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/guuudinforoblox-online-hack-for-free-robux-and-builders-club_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-musical-chairs-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/make-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/ho-to-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-that-really-works-right-away_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_off00002e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E47 22512 bytes
SHA-256: fe0cc996a710a6ba2f581ad8cb686fc3674e8c71ad23201d4ff970bc4ff200dc
font_01_sfnt_off00006051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6051 19056 bytes
SHA-256: 995c6c766dc13810e32ba28e7f7cdabe97511c878370047961326a83a06ea3b5

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