Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fad2678538eb09b…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 01:12:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4a0536db093e044d70ad3b03b3a0b6f6 SHA-1: 3d84148bb4b5f0a8a80579c93149d50c2110e738 SHA-256: 2fad2678538eb09b254506847176502f51949f1a0f0601fe1a45aafa5c7d6e3e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary lure to 'how-can-i-get-free-robux-game-hack' on netcdn.tw. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection scheme. The ML classifier strongly flags this PDF as malicious, and the presence of embedded URLs and a 'download button' lure further supports a malicious intent to redirect users to potentially harmful content.

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/431946152/how-can-i-get-free-robux-game-hack PDF link annotation
    • http://library.unissula.ac.id/fk//repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/pokemon-go-free-kanto_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-to-play-without-downloading_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/pokemon-go-free-vs-ultra_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/newo-ico-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/get-free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-hack-download-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/quelqun-me-hack-sur-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-app-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-hack-filter-enabled-games-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-youtube-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/pokemon-go-free-coins-hack_GM1094591345.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
font_00_sfnt_off000030bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BC 23024 bytes
SHA-256: f3198573b7a55423bd7d38ee5d558ce1026ab5ccd2066b42a61995b408a7de65
font_01_sfnt_off0000648e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648E 18984 bytes
SHA-256: 88d69eb3e5aacbb9415b7e9d5cab519469ee3fdfdf18acc61836835876a3bab2

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