Malicious PDF — malware analysis report

Static analysis result for SHA-256 8967d2dfd17bde68…

MALICIOUS

PDF

33.5 KB Created: 2021-07-20 03:42:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d52632074171781c63af7feb138f07a7 SHA-1: d95cadd3d6d888f28a6330c58bf26aea600842f2 SHA-256: 8967d2dfd17bde683c41b905010f8f305e72c0df045352d24d361d5e680e7df4
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 0.9942

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: http://netcdn.tw/app/431946152/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 http://netcdn.tw/app/431946152/free-robux-2021-game-hack PDF link annotation
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-tiktok-followers-no-verification-or-survey_GM835599320.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_off00002da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA4 22492 bytes
SHA-256: b901b768feda97856a74f990776013499b5c96c0d519cb0a76238c7d37bd2221
font_01_sfnt_off00005fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDD 18600 bytes
SHA-256: a2c5ceeb34a0fdda65f6d16b67831e7179df071a1f7dc46648d6724acc442c88

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