Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b27197feb264b8…

MALICIOUS

PDF

145.1 KB Created: 2020-07-30 14:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4aaff3f290f59206fcb266508cd4ba0 SHA-1: 1beb03d9a6bde784b09484ffe746c3d9e35b609b SHA-256: d0b27197feb264b8f0d15be26a74525c5193b9f1ed85e9b75fc4fdd7407f6d33
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was identified as malicious due to the presence of numerous external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content. The high ML classifier score further supports the malicious classification. The primary attack pattern involves redirecting users through a link farm, potentially leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=characteristics+of+epic+hero+pdf
    • http://files.jgsnj.org/uploads/1/3/0/7/130739991/gexudujuwisa_zoxaxivazigolep.pdf
    • http://files.sincerusgroup.com/uploads/1/3/2/6/132681576/9028298.pdf
    • http://files.alergomed.org/uploads/1/3/1/1/131164431/tafitatewarit.pdf
    • http://files.olathefencecompany.com/uploads/1/3/0/7/130776444/sefirofixafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/20111445381.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9879/files/tomamopekopimaxamelulikib.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/70416263234.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/15503747574.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0435/2190/0696/files/14359608810.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/78995223380.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/57494397383.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/51127630361.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/zufagotofeme.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/fosokinigunubumojumubusak.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3229/files/77551111452.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020010.bin
cf8ad4e38ee68c4e55dc22a40c320f30ce59db6cba800e498c3160df60952fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20010 4916 bytes
font_01_sfnt_off000210dc.bin
b1287380bd12b35941e4631cbf564a59bb179c7a2eebcb26befa6da2755297e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x210DC 11536 bytes

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