Malicious PDF — malware analysis report

Static analysis result for SHA-256 d144dfdb171bc4bb…

MALICIOUS

PDF

43.0 KB Created: 2021-05-19 12:01:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7f3249a0676172b088d041f0a99c5831 SHA-1: ca7a9e81ba54bf657a55866c5e7238fe790de573 SHA-256: d144dfdb171bc4bb89a46d34770139f755178f58bc97afc1c49d5a8c8622c37f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, including one to a 'free generator / game hack' lure. The document body and extracted URLs suggest a scam aimed at tricking users into visiting malicious websites, likely to download malware or participate in phishing. The presence of a link farm heuristic further indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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-fast-and-easy-game-hack PDF link annotation
    • https://www.vacationrentalsincroatia.com/images/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/www-coin-master_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • https://www.vacationrentalsincroatia.com/images/coin-master-hack-fast-org_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_off00004a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A78 25216 bytes
SHA-256: 9e991b426f21cd1828c7bbef2598792d2736abaa48d01e05553c61ae007186dd
font_01_sfnt_off000083be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BE 18864 bytes
SHA-256: 264ac3d9ee16189788a918c90b00fec891485e046f110455159a23ab28eb8c09

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