Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cfd25b94f55104…

MALICIOUS

PDF

42.3 KB Created: 2020-08-23 10:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59af53ef0ec95977bd6e6bc69e337e8e SHA-1: fd73a67dd54fb9b2833895d54f95b51570b4ef56 SHA-256: 67cfd25b94f55104d624ab14e22fffa84149bf2f39cd4e8f9123190df6995326
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The ML classifier also strongly flagged this PDF as malicious. The document's content, while appearing to be about congenital malformations, is likely a lure to drive users to the malicious redirector.

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=malformaciones+congenitas+causas+geneticas
    • http://files.jessicaouellette.com/uploads/1/3/2/6/132682281/zibavuzamebavad.pdf
    • http://files.buyvalentusproduct.com/uploads/1/3/0/8/130874683/lanuma_nozakuzonadiros_kidozuputajog_bagugizaluzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/88314158058.pdf
    • https://cdn.shopify.com/s/files/1/0432/8046/6080/files/tegukijezon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6834/files/xemivajodubepefite.pdf
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/suddenlink_san_angelo_tx_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1075/files/customary_units_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5489/files/koxidepuzibiwurukav.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/siponuwuvosuxexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/93234490286.pdf
    • https://cdn.shopify.com/s/files/1/0452/9104/5026/files/gupujofasag.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/dave_ramsey_free_credit_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2324/files/xizasuxigizesamuvonu.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_off000064ac.bin
35368e23490575e4a724642621f15d9a12b795f56cb2d7c2512f089e9c0f5a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 5208 bytes
font_01_sfnt_off0000764f.bin
c5728bf45a95fd2e45ae24f3d5ca4a02116d7032b12a137f6376949dcd22992b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764F 11164 bytes

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