Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bc9f86592b8b0e…

MALICIOUS

PDF

33.3 KB Created: 2021-07-06 00:14:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9bb42ea067f9b6c82ca5b1184e8d3f35 SHA-1: edf941648080b5b3274d179bfc1f6112ad769a90 SHA-256: 25bc9f86592b8b0e95020a15ee629101ad977745c299d171cda9cbe8bf6693e3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on them by promising game-related cheats and currency. The primary link redirects to known malicious infrastructure, indicating a phishing or scam attempt. The document's structure and content suggest it is part of a link farm aimed at SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-link-ios-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/cheat-roblox-retail-tycoon-116_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-rixty-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/gravity-switch-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/robux-games_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-promo-codes-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/tdm-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hacking-in-roblox-phantom-forces_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-2021-code_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/best-free-troll-avatars-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-no-verification-2021_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_off00002cb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CB4 22628 bytes
SHA-256: 686f2130bee8ec0a8bc8fe0323056387fefc22c81ddd22f4fa61e9dbe785377b
font_01_sfnt_off00005f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F60 18344 bytes
SHA-256: 01b831504896dfaed35d51ec646485350627a831fcdd06f8660974e1004fbd35

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