Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef718ce9b6c2f7e…

MALICIOUS

PDF

39.0 KB Created: 2020-08-24 12:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac4879b10a65c53c625cab4219983f4 SHA-1: 107662b8bd29043ec53254d4f8f2de79cb74a208 SHA-256: 6ef718ce9b6c2f7e87149a64833f4ff5601b8f05ed34c7921e744e716801b1f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to an 'Australian passport form'. The document body also contains this URL and numerous other links to PDF files hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=australian+passport+form+pc8
    • http://xifizo.wildgingerherbalcenter.com/uploads/1/3/1/4/131406086/ddba40ae525e.pdf
    • http://files.northcountryhonorflight.org/uploads/1/3/1/4/131407247/9345291.pdf
    • http://revamaxa.solanocanyon.org/uploads/1/3/1/6/131636725/sisuvavopizabarise.pdf
    • http://danovabun.langtechfun.com/uploads/1/3/0/8/130814328/2946823.pdf
    • http://files.canningcomputerrepairs.com.au/uploads/1/3/0/8/130814176/4323761.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/aeroelasticity_theory.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0956/files/xijovujusefevod.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/wuragenefix.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/diagnostico_diferencial_de_cancer_pulmonar.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/ganakujewepanemezeki.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/gisuzulun.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/vuvoneresifutivododi.pdf
    • https://cdn.shopify.com/s/files/1/0462/6776/0789/files/mizomupujekesakodixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/mifebufofidevugusigepop.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/77027105470.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_off00005b6d.bin
da02892d67b7b955d9ed85a8be24d0740cb4127ce2ce2cd754d05b04885222ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6D 5344 bytes
font_01_sfnt_off00006d79.bin
449e4a971561464dd69f75bb1d21f439766935098b1cd3480409b897845e6617
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D79 9848 bytes