Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4f19082d19b025…

MALICIOUS

PDF

36.3 KB Created: 2021-07-05 20:38:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4a3dd7d89bbee0efcba713e033c0be27 SHA-1: 6a49b8c9681ae351a3087c623f88a62073f088bd SHA-256: 3f4f19082d19b0259e1c2f27ff47da925eafd0b4099b016b5e471141bedb1313
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are disguised as legitimate content related to games and free items. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm designed to attract traffic or distribute malicious content. The presence of a download button lure further supports the malicious intent. While no scripts were directly extracted, the structure and link farm nature of the PDF strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/free-spins-for-coin-master-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7/repository/how-to-buy-pubg-uc-for-free_GM1330123889.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/hack-script-roblox-game-servers_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/hox-to-get-free-item-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/vehicle-stereo-free-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/focus-points-hack-roblox-dance-your-blox-off_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-fly-hack-download-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-roblox-accounts-phantom-forces-account_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-supreme-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-fashion-frenzy-free-games_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_off00003944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3944 22552 bytes
SHA-256: 512a909b3cd766e0a1e9725b74b43b08a6828325306fa097b016867ca90c5169
font_01_sfnt_off00006b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B97 18176 bytes
SHA-256: 0b37b87f907bc50fa1e450587a0e1f43116f92b011bc5b47444974eee354eb2f

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