Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf46e7b8848942f9…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 04:08:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3cfefb99bb5024a873fd989cbce635aa SHA-1: 139ee33922c6066e90690394b389feac92c6d98e SHA-256: bf46e7b8848942f9c01e3c36fc3ccae422ca83c7fc838345953170707e3fd20b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to trick users into believing they can obtain free in-game currency or hacks. These links redirect to external sites, indicating a phishing or scamming attempt. The PDF_SEO_LINK_FARM heuristic suggests a large number of such links are present, increasing the likelihood of malicious intent.

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/free-robux-no-generator-game-hack PDF link annotation
    • https://bancroftandsons.com/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://bancroftandsons.com/images/get-free-coins-on-coin-master_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
stream_003_off00004813.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4813 25764 bytes
SHA-256: 39f919c794116066faadb5d7f6a9c59b1d4af3fcf79613d6cce17c82562ce414
font_01_sfnt_off000083bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BF 18344 bytes
SHA-256: d0a2580a9848789708f711aeedd4c44eef26827bf748da476089155bc80243e8

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