Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b4102826961165…

MALICIOUS

PDF

32.9 KB Created: 2021-06-18 23:19:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5d44d95c8a18c0af003adebdfdf1a3a2 SHA-1: d95dca1982ebb835ba194bc036f3f7eab0b8ff3d SHA-256: 90b4102826961165dde2953d2bd022fb671ff51cbee53827dc05bf0f91e82b59
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links and a heuristic firing for a "PDF_SEO_LINK_FARM", indicating a likely attempt to manipulate search results or redirect users to malicious content. The presence of a "download button" lure further supports a malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/bluebird-free-roblox-youtube-game-hack PDF link annotation
    • http://zercalo.org/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/robux-free-fr_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-head-spam-glitch-at-roblox-high-school-legacy_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-generator-activation-code_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/pet-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-premote-group-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-stuff-in-roblox-2021_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_off00002c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C5E 21420 bytes
SHA-256: 0b24bd83439b469012483aecb26f878ef5b40b502e906be4771cedfdef5fa400
font_01_sfnt_off00005b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B22 19164 bytes
SHA-256: f5bbe3c9a3d5f7b71baa5905dabe58a2f217544f391bd65cb70871fbada75cbc

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