Malicious PDF — malware analysis report

Static analysis result for SHA-256 5121ce86f249281b…

MALICIOUS

PDF

43.2 KB Created: 2021-06-04 04:05:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 920bb87bf0e90f1718ccbf5b4422d4d9 SHA-1: 2a95ffc657fc6a611d65bd50a8c08e249ae7c54c SHA-256: 5121ce86f249281bf252c1789134b0282bda77e69d0babfbf327ce7d88c6c575
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/get-free-spins-in-coin-master-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F1D 24900 bytes
SHA-256: a0e02050611efdf62ca708b409c3cb6765d122d23c3372e7af274a1c12ab9b5d
font_01_sfnt_off00008740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8740 17884 bytes
SHA-256: 156f4ef702737132daa243a2c4fee8c0c13bec142009a1eebf0215f7cb8aef95

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