Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c9b3b2728244f2…

MALICIOUS

PDF

65.3 KB Created: 2020-08-30 23:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b07f6fb528eeaffd4bdca95510436ae7 SHA-1: 316dcebf6036d76903827d0a7a041988e1461d01 SHA-256: e3c9b3b2728244f2fb5542800f7cd6dddadf60777acad63a83168f274b6f2a04
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link that points to a website designed to lure users into clicking. The document body, though heavily obfuscated, contains the same URL. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms the malicious nature of the embedded URL. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=the+great+barrier+reef+ielts+reading+answers
    • https://static.usrfiles.com/ugd/8b97dd_2cf7e4b28c90432e838f028de2450b7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bf9632746ed458aacff48ff9b45cbd9.pdf
    • https://static.usrfiles.com/ugd/9c43ec_e4fde60f21f14f09885b3051af2de260.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3747/files/jusejanugufajas.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/54810063272.pdf
    • https://cdn.shopify.com/s/files/1/0431/6554/8705/files/nissan_diesel_truck.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/cstr_bioreactor.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0358/files/bestimmter_artikel_bung.pdf
    • https://cdn.shopify.com/s/files/1/0432/7384/6952/files/libros_jorge_baradit.pdf
    • https://static.usrfiles.com/ugd/b98abb_a3e2a659860246198f80292f5d0526ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_6263b29036f743c0a76294c39c240abd.pdf
    • https://static.usrfiles.com/ugd/b8c837_586882f55bae49f7be74bbd8bae9132f.pdf
    • https://static.usrfiles.com/ugd/b8c837_21185b2c102c45cb8d6790f78e68726b.pdf
    • https://static.usrfiles.com/ugd/09273f_4be5f69173bd4ee797632e1e6a7239fe.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abc8.bin
621c52e3029125169476dea90474232c5ab372814d4a459f557ceda47459a3b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC8 5352 bytes
font_01_sfnt_off0000be07.bin
21f909065a0e0fdf30687bd099b8f5d658a8fe56fae23b02286522c894261025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE07 10744 bytes
font_02_sfnt_off0000e2b7.bin
e2bbaf85e9d11df6137a4891019537bf960f709af88b09d9895870a0a5faf052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 16064 bytes

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