Malicious PDF — malware analysis report

Static analysis result for SHA-256 131358afa2efe56f…

MALICIOUS

PDF

34.5 KB Created: 2021-06-23 10:54:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: edba2f7fb6879184f6272414454f2510 SHA-1: 5940e34250300d444c094869c465f17e37e41067 SHA-256: 131358afa2efe56fa94f9847380fa2d95636eaa79d626e01aa259bc6ed257f0d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing a 'game hack' theme to entice users. It contains a large number of external links, including a primary link to 'netcdn.co', which likely serves as a redirector or download host for malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites.

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/cheat-engine-robux-2021-game-hack PDF link annotation
    • https://library.um-sorong.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-dresses-for-roblox_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/diamond-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/ultimate-trolling-gui-roblox-download-free_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/http-bitly-coin-master-free-2021-spins_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_off00003017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3017 21956 bytes
SHA-256: 3db7dee1645f219fb26c01d76bfd40613a4db8e6b579923cee274bd07af57e67
font_01_sfnt_off000060de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 19344 bytes
SHA-256: 9c1cf510a1d3456c0c48936a1bf8b9c327f38ecdecd0612069f895891075c924

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