Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43c55d9642733e3…

MALICIOUS

PDF

36.5 KB Created: 2021-07-03 19:28:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ec9e5e3f99a9bce1e5d4e800388e8ece SHA-1: 09a571ea7cda2156d65ae20a5fd1a6c3854c7e19 SHA-256: d43c55d9642733e3b7c1df896d8003c8f70a548af2fcc5b6a9dc57c92df42f53
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them by promising free game items or hacks. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The document's content and embedded URLs strongly suggest a social engineering tactic to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-spins-for-coin-master-game-game-hack In PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/roblox-hack-cheat-free-robux-generator-online-exploit_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-shirts-templates-non-copyrighted-roblox_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-stuff-on-roblox-glitch_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/getting-my-roblox-account-hacked_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-sell-stuff-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/roblox-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/roblox-a_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-com_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_off00003897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3897 22868 bytes
SHA-256: 90fbea23b8b8c34a943316f54fba9a9d717d1cb1f26fe67d4576de65e5c3c147
font_01_sfnt_off00006bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC4 18432 bytes
SHA-256: ba2b1c803cf60430fecd3a4ea667911e0c566277fb0db9da711a2662cfde09a8