Malicious PDF — malware analysis report

Static analysis result for SHA-256 7987fd5efabdf43a…

MALICIOUS

PDF

44.6 KB Created: 2021-05-18 04:08:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ed3a2dbd5fc29004cf82d42726d6759b SHA-1: de87b5c9efab34664d210c270998cd319061f912 SHA-256: 7987fd5efabdf43a48e455976107a3d96556d102f0f181892051573aa7420cdd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites that are designed to lure users with promises of free in-game currency and hacks. The ML classifier and specific PDF heuristics strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest a phishing or social engineering attack.

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-with-no-verification-game-hack In PDF document text
    • https://luyenthitoanpro.com/public/upload/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/robux-sites_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/my-robux_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_003_off00004850.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4850 28772 bytes
SHA-256: 97c5a665a16141bdcebbb190ba318df8b0cdcd293b49ebac7480682bdd5dc0a6
font_01_sfnt_off0000899b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x899B 19128 bytes
SHA-256: acb72b37f9b0a7ac0fa23716fb81d4af9379ab539551c05381b29cd372bdbe33

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