Malicious PDF — malware analysis report

Static analysis result for SHA-256 34980cb2fc91dff3…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 17:23:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 257f797535fdc7a348b207a5697d5e94 SHA-1: c952b6a1fc7c96db833c9922585ccb0435a2a5f1 SHA-256: 34980cb2fc91dff3c5b5f0cdfaf9522ec338f2f064bdba2ea461d4f947c54e44
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 0.9865

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.tw/app/431946152/how-to-get-free-obc-and-robux-in-roblox-working-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.tw/app/431946152/how-to-get-free-obc-and-robux-in-roblox-working-game-hack PDF link annotation
    • http://arpinoturismo.it/images/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://arpinoturismo.it/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/robux-codes-free-2021_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://arpinoturismo.it/images/roblox-free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/how-to-hack-retail-tycoon-roblox-2021_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/roblox-how-to-get-any-gamepass-free_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-robux-no-logo_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_004_off000051ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AB 24388 bytes
SHA-256: e3364cbb1cd5c007028d71fde8aec78b7c8938e879f443cf6994217644e9fe85
font_01_sfnt_off00008929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8929 19304 bytes
SHA-256: 21bf6e1c101cc3b1e08bdf27af3bc6ab986a4015af8feadcf74e3afe0e03124c

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