Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c9b82bf9607efe…

MALICIOUS

PDF

34.4 KB Created: 2021-06-29 03:09:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 41ad38253fd0c49aff3303ae0c2a6d5d SHA-1: 5089fa2ea46fe714867ff6975fa11fa4b1321242 SHA-256: d7c9b82bf9607efe434e59d14aebaa5cbd37cf023ba522cbe4e5765ec8be37a5
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of links, many of which are algorithmically generated and point to 'free generator' or 'game hack' lures. The primary purpose appears to be directing users to potentially malicious websites that host scams or malware. The ML classifier strongly indicates maliciousness, and the link farm technique is a common method for SEO poisoning and distributing unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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-games-obby-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-hack-scripts-for-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/game-codes-eu-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-robux-on-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/http-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/pastebin-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-dumb-brothers-roblox-accounts-easy_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-set-up-pf-pros-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/clickbait-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-shirts-on-roblox-no-bc-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-spins-and-coins-coin-master-app_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_off00002ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF3 22132 bytes
SHA-256: b2f7a26867918c2fa73e0215fd8ceffbe3ed6e58f234bcc46415ceb676c12abb
font_01_sfnt_off00006133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6133 19156 bytes
SHA-256: 62f9e7f6aa55f929ccc1e86b500ed6ce81ba879b7abd2b9cc2df4bc1fce90e52

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