Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bf4ccba3e75f82…

MALICIOUS

PDF

35.2 KB Created: 2021-06-30 04:11:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5f26033073424c3daead18b2db7f1887 SHA-1: 38c1951173fbf128ecea6243fd466ce59577e7cd SHA-256: b8bf4ccba3e75f8244215236b29b6de4422674bb10cec1bedf27b132d2a86d8c
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/roblox-group-admin-hack-game-hack PDF link annotation
    • https://library.itn.ac.id/perpusitn/repository/roblox-retail-tycoon-tree-cheat_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-create-a-free-vip-server-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-free-robux-that-really-works_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/roblox-account-hack-download-free_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/robux-hack-generator-2021-no-download_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/steves-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/descargar-hack-roblox-robux_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/minecraft-noob-vs-pro-vs-hacker-vs-noob-roblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/cheat-codes-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-robux-instantlyeasy_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/hex-number-gives-free-robux_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_off000030c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C0 22628 bytes
SHA-256: 4770f2009de58941986ae460a858f37bf57fd0abbc1765420092e88d547f9065
font_01_sfnt_off00006332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6332 19524 bytes
SHA-256: 665985b096355b85735b7d9f8fd500af51baf8275d699c8bbc26e02232a58235

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