Malicious PDF — malware analysis report

Static analysis result for SHA-256 d149758dd3df9f8b…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 18:59:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1fe97e77af534f5d44d8d2e728a641cf SHA-1: 8ef87e63a6362f88da3108fb72e1403df739e53d SHA-256: d149758dd3df9f8b89353aa2ea213a7e76d6f5231a160d6681408815968ac1ac
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to game-related "free spins" or "free robux" lures. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and the ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The document body and embedded links are designed to trick users into visiting potentially malicious websites, likely for SEO spam or to distribute further malware.

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.tw/app/406889139/coin-master-free-spins-daily-link-updated-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-guess-the-song-cheat-sheet_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/ww-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spin-link_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-pin-codes-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-hacker-us_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
stream_002_off00002fec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FEC 23396 bytes
SHA-256: 885e595655b203fedbce3f783a13ea7049449d2fd59b58ae11713f50e04c49f2
font_01_sfnt_off00006512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 19128 bytes
SHA-256: 2140352465974415e356fb4466e0de00f5c4596de6cfd7dfe4c3405bd42c3af0

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