Malicious PDF — malware analysis report

Static analysis result for SHA-256 040b0f377702365b…

MALICIOUS

PDF

45.6 KB Created: 2020-07-20 23:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aee6ec5efc324b9ec7eeefc14f2439f SHA-1: 1c6a8ff2fa357b2eb19eb26be455ec4bea318345 SHA-256: 040b0f377702365ba4151e8c4bc1648d078e091b7e1a1b5706a18272e8a2ded6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many pointing to external PDF files hosted on various platforms. One of the primary links, 'https://ttraff.com/wb?keyword=bearing%20clearance%20chart%20pdf', is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious infrastructure.

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.com/wb?keyword=bearing%20clearance%20chart%20pdf
    • http://files.staging.cornrowsandco.com/uploads/1/3/1/4/131438180/4d67afdbc51.pdf
    • http://files.stjoseph-stpaul.com/uploads/1/3/0/7/130775950/8226148.pdf
    • http://files.nworldweiqi.com/uploads/1/3/1/4/131453431/4578662.pdf
    • http://files.johnbhenry.com/uploads/1/3/1/4/131483110/wosuxemok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/guwegiri.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/91929604500.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/pozisowifoj.pdf
    • https://bidaleb.files.wordpress.com/2020/06/88753637697.pdf
    • https://tanebum.files.wordpress.com/2020/07/besim.pdf
    • https://xusemoribeva.files.wordpress.com/2020/06/92001178183.pdf
    • https://puxopumeget.files.wordpress.com/2020/06/12384384102.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/58391112398.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/48589899301.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/58823906320.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/dilap.pdf
    • https://cdn.shopify.com/s/files/1/0428/5887/2998/files/kimixonubuxogoxefak.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/marubuvimupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/62589354303.pdf
    • https://cdn.shopify.com/s/files/1/0430/8988/7399/files/31800987204.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_off0000779b.bin
13738a22e6387e2c2822ce88825a4899f94726d35bd4cb26ef07824b6f2abcd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779B 4968 bytes
font_01_sfnt_off0000886f.bin
64852298bd113c3677e6d40b59a316bc77041b027ad6f41d900f7d403668efdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886F 9620 bytes

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