Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b8f0c28d588a7a…

MALICIOUS

PDF

46.1 KB Created: 2021-06-04 02:16:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4ddeb6999591b14f065bc190220afb0f SHA-1: dffd9e2c63da6cfe964cf2a58f3b651f1561cd89 SHA-256: 32b8f0c28d588a7a2cf592bdb4c11a2b3f15330907e2ecc34ec2e869464acd17
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external PDF files, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic suggests a deceptive user interface. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to potentially harmful content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 https://netcdn.online/app/406889139/free-coin-master-spins-game-hack PDF link annotation
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005107.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5107 24396 bytes
SHA-256: 3b3ead09176294b2c65aab9daa22494bf9c912ceba1b2e7b38ac62d6bec4421e
font_01_sfnt_off000088d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D4 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000092bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92BF 17884 bytes
SHA-256: dbba0adc3b1b7bb8b2e5e51fec5d28ab169e2f7a165ed2a14d616932af559aea

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