Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a98ffc2aba8a425…

MALICIOUS

PDF

36.1 KB Created: 2021-06-19 21:36:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 384601965ead4e0a78d54437be997169 SHA-1: 10b43454e5b91d0477e04a9e5bce2a196d8554ac SHA-256: 8a98ffc2aba8a425d2f6eea69855da46e6969cef81d5985f2248dcc0301826b7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

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 http://netcdn.co/app/431946152/codes-for-adopt-me-roblox-for-free-money-2021-game-hack PDF link annotation
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/free-games-and-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/the-conquerors-3-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/como-hackear-a-un-amigo-en-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/roblox-chat-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/how-to-get-free-robux-2021-website_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/free-roblox-hacker-co_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/attack-on-titan-downfall-roblox-play-free_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/unlimited-robux-and-tix-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/roblox-how-to-get-welcome-to-bloxburg-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/hack-vetement-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://pustaka.antropologi.fisip.unand.ac.id/repository/how-to-make-a-pretty-roblox-girl-free_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
font_00_sfnt_off0000327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x327B 22696 bytes
SHA-256: 2d123241429cfa17321c66f6743ca8b80d0e5847cf1ec167b325c8ec8c0a6d6a
font_01_sfnt_off00006575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6575 19884 bytes
SHA-256: e01dcdb85487f663f5ed5ca6eadeffc1b206cf9e608ee5948009bdc45bc216ea

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