Malicious PDF — malware analysis report

Static analysis result for SHA-256 329aba5cd2e79080…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 12:26:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d24df284197bc523cedb96cfe258aa75 SHA-1: 1a5d2985700f39438d2560d657e7431b4fa86105 SHA-256: 329aba5cd2e79080030b975d1bbbabf13fdff7d2235120089d5de98e41c55c46
142 Risk Score

Malware Insights

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

This PDF document employs a common lure of free game hacks and in-game currency to entice users. It contains numerous external links, identified as a PDF link farm, which likely serve to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/479516143/minecraft-java-edition-free-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/pokemon-go-free-download-version_GM1094591345.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/ways-to-earn-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
stream_004_off000051e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E6 25544 bytes
SHA-256: 9de7df8b4fced69c6725e01a1fa979b9a92f2b81c7dda09875c6b5a9be6b82bb
font_01_sfnt_off00008b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B73 18164 bytes
SHA-256: e28d0ded599416f75746d42b4ddd49ac4ed584cd54835945167b34c6d366202b

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