Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bb891fe304911f…

MALICIOUS

PDF

44.2 KB Created: 2021-05-14 21:34:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4ad8146d3647c38bb61f750d8a3eecc8 SHA-1: 213c4c97297183c038fa19f3f0bca118af285954 SHA-256: d4bb891fe304911f5377dbe6eca88167304b51b685b3a04b27516a85db98744a
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 0.9976

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/free-robux-2021-no-human-verification-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/free-robux-2021-no-human-verification-game-hack PDF link annotation
    • https://adirp.id/upload_data/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://adirp.id/upload_data/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://adirp.id/upload_data/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • https://adirp.id/upload_data/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://adirp.id/upload_data/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • https://adirp.id/upload_data/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://adirp.id/upload_data/files/robux-today_GM431946152.pdfIn PDF document text
    • https://adirp.id/upload_data/files/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004855.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4855 27756 bytes
SHA-256: 48787c560ea87a1c373e780f23d3f4b9651833b1eed63e8df7712cc25abf99ea
font_01_sfnt_off00008768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8768 19260 bytes
SHA-256: a5b009a33d06eb91b5687aca452054299973906144ac3f9b2fc2dd0e2fef1dac

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