Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8fa31c5a7a5b84…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 10:01:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 668b4744b7f533a2fb843c1c829cb8c5 SHA-1: b590253eded86586574d47a9e60220f96aca1893 SHA-256: 6d8fa31c5a7a5b840f9755f073b4095491b060d98ecf2c28fe0b4f236e8b91ab
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. These links redirect to malicious infrastructure, specifically identified as a redirector at http://netcdn.tw/app/406889139/free-spin-app-coin-master-game-hack. The document's structure and the presence of multiple SEO-optimized PDF links suggest a campaign to drive traffic to potentially malicious sites, likely for malware distribution or phishing. No scripts were extracted, but the PDF's nature strongly implies exploitation for client execution.

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/free-spin-app-coin-master-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-script-for-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-a-profile-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hacks-para-wall-por-el-chat-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-1-minute_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-client-for-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-to-play-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-how-to-fly-with-cheat_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-extreme-nijecotr_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-accounts-agust_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-guuudd-info_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-noclip-hack-august-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-para-tener-robux-enderobux117_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_off00002fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBB 22920 bytes
SHA-256: 5b65e7422ba9f25f6ae79c595b069963dd70fec9ee591e632059f1e347f8d438
font_01_sfnt_off00006293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6293 18176 bytes
SHA-256: 19de47686a5a671c520268dc4f5b8264b0bb7386033903720c232ddf6b7fc3d6

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