Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3d9a0bcd37bad2…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 22:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 642c9a42fc41fddeb768be7b80c32cfa SHA-1: d5f6ce9c5bc6ee26903171cd2dff536bf3404bb8 SHA-256: 6b3d9a0bcd37bad27c868cafbbd5c1483ed846391f76bbea8c284a0fdc2e5531
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a GMAT writing template, likely a lure to encourage clicks. The presence of a malicious redirector and a large number of external links indicates an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.cc/pify?keyword=gmat+awa+writing+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d1d005_4024729c972a4e638946d1f6d6bf29e6.pdf
    • https://static.usrfiles.com/ugd/837d34_60d07ad4fa884e9383a6cbae6a38bbd7.pdf
    • https://static.usrfiles.com/ugd/de65f7_a722b8db991245c8a7794403f40bdd4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7db0d350fd5647a1a2727bb7f3977c85.pdf
    • https://static.usrfiles.com/ugd/b8c837_879096ab34394befbb45a06787a03215.pdf
    • https://static.usrfiles.com/ugd/b8c837_88832ff918c442568b08c5cada25cd28.pdf
    • https://static.usrfiles.com/ugd/6846fe_19d55c9250f94a0c874bd242ca158790.pdf
    • https://static.usrfiles.com/ugd/a58b01_9398bfef479044febabf94f481482416.pdf
    • https://static.usrfiles.com/ugd/b8c837_281e734dd9934f03bbd40e4afd39e7fb.pdf
    • https://static.usrfiles.com/ugd/362633_d8085edf002b4273b06dcddf7758e6e0.pdf
    • https://cdn.shopify.com/s/files/1/0464/9415/4904/files/99755073623.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/tapumekeje.pdf
    • https://cdn.shopify.com/s/files/1/0430/9994/7162/files/avivahit_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9773/5843/files/add_custom_report_to_dashboard_google_analytics.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/scheme_reverse_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/4901/5713/files/car_racing_game_for_pc_windows.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2733/files/vujaditofabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8930/5506/files/tujomujolefo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7518/0446/files/rafovez.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/tinkle_digest_online_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c9.bin
536b6357c27c2f1a38390b7f498cdb950d4a3cbcb688325c966dc10e0c9bafbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C9 5084 bytes
font_01_sfnt_off00007613.bin
a417833321c09154a39f5d4659919dab6cb75c94e2812106ffb3e9eb96e092b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 10948 bytes

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