Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56a7b746ca5e722…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 17:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eb141c6b55c8e82802a3d3118388a94a SHA-1: ced67a5f779b3ab9a5e661b47881b185b1dd7435 SHA-256: d56a7b746ca5e722016415c2f2d5113aa9402ff9e0fd2163beca3644d1175f89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, 'ttraff.link', which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic.

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/pify?keyword=ipcc+report+2018+gwp In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/20003508692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3535/0424/files/mibobe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/zunopetew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3501/6863/files/85135364020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/jobamodanox.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f967ac_728d72fb349949119a5f882059b12ec0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2f7e1_676e8c67a32e421792b5c1f245314290.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/24853a_022a746bf7d147e78d5e3e6fc60a2389.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5e8de6_db7e778a966e4389926dcfa1ec743d9d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6195/9069/files/free_w-_9_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/2_bestanden_samenvoegen_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/puzagofip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1464/2070/files/wetubizetojofunezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1392/1175/files/cassette_video_game_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/808_warfare_torrent.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6817 5228 bytes
SHA-256: d9d4e371f26ef0a70a0b66eb21b02fe01a846541e09e23169f4f85bcd802f17b
font_01_sfnt_off00007a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A11 9924 bytes
SHA-256: 0b0aaf9dab1283c9c738bfb2c9d8f923afb871c23a129721063b723891c63e5d

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