Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f43a1df020d802…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 08:00:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e5519b99e7aa4ce8b57ee492dba55c38 SHA-1: 8c27341f52a4d7ac732517b97b18107daf995dba SHA-256: 78f43a1df020d802f95587faa50fed28b64878f44a1c87febd26197a77d60a9c
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 0.9971

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/how-to-get-free-robux-2021-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/how-to-get-free-robux-2021-game-hack PDF link annotation
    • http://battistibrothers.com/system/userfiles/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/hack-coin-master-without-root_GM406889139.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_off000049c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49C5 24628 bytes
SHA-256: 14a8103c2e563ceca56c9b0045c225d07e10b6ab9d2ffa3d3dac36ec7592208c
font_01_sfnt_off000081ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EF 18684 bytes
SHA-256: 662354714a7c4aa127b8bd681013e9d5d113fbfc5a2f5afb2d34764175bb04a5

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