Malicious PDF — malware analysis report

Static analysis result for SHA-256 72544c9e72341a86…

MALICIOUS

PDF

47.7 KB Created: 2020-09-18 16:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a848b207371c883a5bbd9458a7b6d4ef SHA-1: d5e55b93565c3609008f2c814f6cdf16611b01a2 SHA-256: 72544c9e72341a86049a3cab98f35100e764f8b79286b778ce7574e6103c4692
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains, suggesting a link farm or SEO poisoning attempt. One of these links, 'https://ttraff.club/wix?keyword=c%252B%252B+iterate+through+string', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious redirector and the link farm structure indicate a malicious intent to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/wix?keyword=c%252B%252B+iterate+through+string
    • http://files.mathessentials1.net/uploads/1/3/1/8/131860787/mozodamakemi.pdf
    • http://mejuse.resource-economics-austin.com/uploads/1/3/1/4/131410158/543559.pdf
    • http://files.extrusion-consulting.com/uploads/1/3/1/6/131637496/b86f022.pdf
    • http://jupefusa.dphsart.org/uploads/1/3/0/7/130739344/9073402.pdf
    • http://sudelif.fifecarerscentre.org/uploads/1/3/0/7/130738796/wuwolozojokugit_sasoxut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e14d4180-6435-44cc-9612-04fb72e55251.filesusr.com/ugd/c79b1c_16b6cda0e7f4402ea2595500be75cb7c.pdf?index=true
    • https://ad39b672-605e-45b6-9cb0-9a0c9b5bf9e6.filesusr.com/ugd/a2e20a_36b23f4906d145619cd7960b9d4e66ac.pdf?index=true
    • https://29486735-6410-42fb-a90b-1888fd783de9.filesusr.com/ugd/dbbfd0_fce56426c18046e9a33939444e89c7ee.pdf?index=true
    • https://68e012fb-a822-4fe5-ad64-4ba219beabc5.filesusr.com/ugd/b916f4_e09936405fcc4104b78169a597372a80.pdf?index=true
    • https://4a65d5ef-72b9-458a-bf57-1e52b29ee144.filesusr.com/ugd/6f58fb_c297271089c74b76b515e118533ab24a.pdf?index=true
    • https://623696d7-4cd1-4b02-b8df-284c778779e4.filesusr.com/ugd/98d33d_6cf1a77f885147b7b06862f59cae9d54.pdf?index=true
    • https://bb4f18e7-8b1d-4e65-b474-df97a8cc417b.filesusr.com/ugd/0049ca_620238d9116c4f36a61ab107a21a9de7.pdf?index=true
    • https://13be6bd6-6bbb-4c03-8ca6-f4d5565f7702.filesusr.com/ugd/c46c8a_e78f8a032ce44f3c8e833a956be7f0c6.pdf?index=true
    • https://e459c24d-21ca-4395-803c-a4789c9e6421.filesusr.com/ugd/39a0fd_4eac0c2055554f20b1d8f04372843ac1.pdf?index=true
    • https://4fb7af47-5b64-47d4-9e84-95c837e5f214.filesusr.com/ugd/9d869b_42f4e94fa50e4c53b0abb5496eb0b4e7.pdf?index=true
    • https://67967b5e-658a-4fcc-bb1c-493102250a74.filesusr.com/ugd/6203b9_86c80358644d49bc8563b7b74726b062.pdf?index=true
    • https://a9961391-7d0c-4cf2-96df-7043ff564e18.filesusr.com/ugd/735424_0ad820076d0b41a1b65c7a265507410c.pdf?index=true
    • 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_off00006f88.bin
e03197599766f672234676e19da410b50f1285a544aa99af221311277f96ff42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F88 4820 bytes
font_01_sfnt_off00007fe3.bin
2a913bf1a42db879d28f1dbea8e0e752b20c17ec3b472dd464a7c57f7c112d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE3 16048 bytes

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