Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0a492a079c1b51…

MALICIOUS

PDF

33.8 KB Created: 2021-06-19 03:14:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8d132bacf203474da99e9ae557176b30 SHA-1: 08973e87b33457526dcf492c66d779171da5c9ce SHA-256: 2a0a492a079c1b517be201078b24afe90948cbd7deed76553ab7ac1a1b1f6816
102 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are structured as SEO-optimized PDF link farms. The document body and extracted URLs suggest a lure for free in-game currency or hacks, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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/free-robux-irobux.com-game-hack PDF link annotation
    • http://www.nfca.org.tw/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/easy-robux-hack-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-here_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-script_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/como-hackear-un-server-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-make-a-computer-hacking-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-50-000-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/pokemon-go-free-coins-hack_GM1094591345.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-coin-master-343-apk_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_off00002dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD0 22184 bytes
SHA-256: 12cfbd59d7366811a04c0659c18f10fabd2761b98e8eea3a09108f226eaee6b5
font_01_sfnt_off00005f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F26 19044 bytes
SHA-256: fee8f833fcb34e55358a8462cff51365b19bb656375ab60d9dc965622d541851