Malicious PDF — malware analysis report

Static analysis result for SHA-256 321b419d1ef17e0b…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 05:43:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 095a32ae825c14c9a32c441b78c3deef SHA-1: 6ff853898c938ae45931c64f866d66f0ba4b9de2 SHA-256: 321b419d1ef17e0b7150600f2b96b487822954a0b336c5045406ed1ac0423dcf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are SEO-optimized lures for game hacks and currency generators. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, and 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to a redirector for game-related exploits. While no scripts were explicitly extracted, the nature of these links suggests a phishing or scamming attempt, likely leading to further malicious downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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 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.tw/app/406889139/free-spin-coin-master-link-2021-game-hack PDF link annotation
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/robux-download_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-get-free-robux-without-taking-a-survey_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/http-roblox-hack-no-varvaction_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-get-games-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/roblox-robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.matsanesa.net/__statics/gudangsoal/files/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307D 22804 bytes
SHA-256: 72cb56fcffeb4675b1f167662e3563b276daea715605f338156e10473945860e
font_01_sfnt_off000063a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 18748 bytes
SHA-256: 21e227a5b4a4e86201c5ffd53a68098e06ad4a81ecbeade678e9824eb4386a01

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