Malicious PDF — malware analysis report

Static analysis result for SHA-256 736d6727316df808…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 07:16:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a2ab867369b6eabeb7cbe294be92b3f7 SHA-1: b2ff19d578b2189958374581e2796a72eee99c05 SHA-256: 736d6727316df808531a2e6d49a55f168c762448726ac06a552c162d5f7f7aab
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 0.9865

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/406889139/how-to-get-free-spins-on-coin-master-without-waiting-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-free-apk-java-edition_GM479516143.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_off000053b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B4 24492 bytes
SHA-256: ff2d0267294df536663a573847fae7cd7f7ef104595f4d0a24299418ec8ea083
font_01_sfnt_off00008be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE6 18844 bytes
SHA-256: 74e90038a15acf9d59ef996dfbbccefa77ce85bd889c53575e7537e702976194

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