Malicious PDF — malware analysis report

Static analysis result for SHA-256 a688fb1cc708012a…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 17:52:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3293d3a410841c1e8cfcf4bd0b0595f SHA-1: 18b859f25a7cef162b2dfca87f9827a46506ae22 SHA-256: a688fb1cc708012ac1aef58f7db726d5bd770e0c0f158c28a756795f06007594
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.tw/app/479516143/minecraft-complete-handbook-game-hack PDF link annotation
    • http://library.imz.or.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/hack-roblox-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-free-robux-2021-mac_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-mad-murderer-hack_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-admin-commands-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-sites-that-work_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_off00003216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3216 22812 bytes
SHA-256: 03cd2c61598a457247cfd0aae63a3a4ba850c1f46bd0b159c0e851b3a4ac7543
font_01_sfnt_off000064f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F0 19008 bytes
SHA-256: 3d4c969307bbdb220863567c701ff0e22ec78a4b6d04f35c3615ddb0a474c515

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