Malicious PDF — malware analysis report

Static analysis result for SHA-256 155f6c637ee36d85…

MALICIOUS

PDF

47.8 KB Created: 2020-07-29 14:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64ee63a997c5dc246a2fcf264dd6aad SHA-1: 3fb43fb18407e9a7bdb3d7df15cf0093358d7044 SHA-256: 155f6c637ee36d85c7981adb59e4c4037858c4b64d2a1173c7ed37efde22d106
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The embedded link directs to 'ttraff.cc', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the heuristics indicate a large number of external PDF links, suggesting a link farm or SEO spam tactic. The ML classifier also 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.cc/pify?keyword=logical+reasoning+books+for+cat+pdf+free+download
    • http://files.pccinscape.com/uploads/1/3/0/7/130776887/386fa0.pdf
    • http://files.plumislandweavingco.com/uploads/1/3/2/6/132695574/wazokejozuduw.pdf
    • http://files.catheymccrary.com/uploads/1/3/1/8/131857213/6490069.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/4413/2248/files/13043545540.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/82500576606.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/zitopitipidusukov.pdf
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/61355632801.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/xaxopaxinoses.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/24927941195.pdf
    • https://cdn.shopify.com/s/files/1/0433/6120/6422/files/61918310467.pdf
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/sepekitebunozogukinagabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/wegezumaguwubeselozefebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/pakopigosegirodedewe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/94986899078.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/jokewusakumoduvuxuwuxas.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/momurunok.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/nigiruzokekuwuparajax.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_off00007ca9.bin
90521afd633246338643129d665eefe5d9745c4e36a658b42ae704f939dc120c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA9 5348 bytes
font_01_sfnt_off00008eee.bin
eb0c6e9f78a2949fec91153df3e7712eb5a6e917439b88defc31c0233611427f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEE 10040 bytes

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