Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fb32a79800c179…

MALICIOUS

PDF

49.2 KB Created: 2020-09-05 14:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5eb5c53a1709995c48de4bf52faf71 SHA-1: 85848f8a047dadde7d30d925db6fe8c4ed8ad023 SHA-256: 75fb32a79800c17960860ba37ab162869f5e10e463ab8cdf8a30aef0ccbf26ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links, including a primary link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to financial indices and also repeats the malicious URL. The presence of a link farm suggests an attempt to distribute malicious content or phishing pages.

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.link/wix?keyword=bloomberg+barclays+indices+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/8309/5452/files/barron_s_sat_vocabulary_flashcards.pdf
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/117303673.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mudamizoxudaxusuzo.pdf
    • https://static.usrfiles.com/ugd/3b47cb_b11d2e9e793f492eb64f7a93e628064b.pdf
    • https://static.usrfiles.com/ugd/8b49c6_663613095a314e398fea79d4b07f627a.pdf
    • https://static.usrfiles.com/ugd/2813e2_6f08cefaea074e098ea5608af0fe4ef1.pdf
    • https://static.usrfiles.com/ugd/479fa9_61bdcb2a8b8d4c4b83684fac14f87655.pdf
    • https://static.usrfiles.com/ugd/b8c837_373ce20d6860424db49265a61ef8f6a9.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/48316200320.pdf
    • https://cdn.shopify.com/s/files/1/0440/0388/5206/files/37487537012.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4365/files/83985669485.pdf
    • https://cdn.shopify.com/s/files/1/0435/0305/9110/files/osmosis_and_plasmolysis_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/south_africa_work_permit_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/womonevixaxijebuvi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007243.bin
dfa70066db486a7a5a67fa54394f4a077177eaada6c29c081051c1d6319cc979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7243 5472 bytes
font_01_sfnt_off000084be.bin
5611e2c50d2b857351a1674489a62ca7578e621d4e4075b3ac593b6ab92c2604		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BE 10820 bytes
font_02_sfnt_off0000a96e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA96E 4324 bytes

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