Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5972134ec34eb0…

MALICIOUS

PDF

45.3 KB Created: 2021-05-12 15:05:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ee2d3cdcad62314a0686f98ebd1d4abf SHA-1: d05dafe9ccdf0c6d50d1855e9c43fda927ca224b SHA-256: cf5972134ec34eb00f7533da9cfa1ec171ce632b5c5d6927cd8376f7123efe32
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/best-free-robux-sites-game-hack.
  • 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 https://netcdn.xyz/app/431946152/best-free-robux-sites-game-hack PDF link annotation
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/add-robux_GM431946152.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/20210-robux_GM431946152.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.eisgroupme.com/uploaded_files/userfiles/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1D 24708 bytes
SHA-256: 956cbdfce65434678b3aa064807a171aa35ae17c0478163d5426017fa8d64393
font_01_sfnt_off000084b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B3 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC3 18236 bytes
SHA-256: 68f5330c443815a71c203001c9650c5b168215c0ad869b16e6a359c0f2b36386

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