Malicious PDF — malware analysis report

Static analysis result for SHA-256 c246237341a0323b…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 11:44:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 231c0beabb2ada3753cbcafa2ee77f3b SHA-1: 51d2b1a24ff1c4266fcd2b5543418ed382c4a145 SHA-256: c246237341a0323b2d956bb34fbb829de2d34dbfefd679c4b27bf7f8c2df5aa4
142 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 0.9865

Heuristics 6

  • 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.tw/app/431946152/advertise-for-free-robux-game-hack.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.tw/app/431946152/advertise-for-free-robux-game-hack PDF link annotation
    • http://103.40.122.33/akasia/repository/roblox-free-robux-hack_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hacker-day-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-just-enter-username-no-verification_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-no-human-verification-or-survey-2021_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_off0000525e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x525E 25620 bytes
SHA-256: d7afbc1dd1880a9594b2635d08dc9c2e475f86095ee118b529380f50b02f0122
font_01_sfnt_off00008c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C65 18524 bytes
SHA-256: eff853ad0ca80e7b7b4055103332b2f689fce8e40badcc0e57d98ca47d30afb8

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