Malicious PDF — malware analysis report

Static analysis result for SHA-256 98173290382f3dfa…

MALICIOUS

PDF

47.6 KB Created: 2020-07-08 21:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff19f4c6f0b0cdd62eacd41746d39e2 SHA-1: aa97ff25b163d9c5565a608648e2250a880f19f4 SHA-256: 98173290382f3dfa7ad75a022ae3efc8a098b7d27d0598910a7c46d5b211fd91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which point to SEO-optimized PDF link farms. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains the text 'Manual exchange transfusion protocol' and includes the primary malicious URL, suggesting a lure to disguise the malicious intent. 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/wb?keyword=manual%20exchange%20transfusion%20protocol
    • http://files.manyanabeachpad.com/uploads/1/3/2/6/132681316/f4916.pdf
    • http://files.425sqn.org/uploads/1/3/0/8/130814642/zotazaboma.pdf
    • http://files.sweetcloverrabbitry.com/uploads/1/3/1/4/131438439/zalowakoja-somokafogof-posajosotum-ropesukeguk.pdf
    • http://files.delawaremusic.net/uploads/1/3/1/4/131437778/502d98e3f9fa38d.pdf
    • http://files.cninc.org/uploads/1/3/2/7/132740479/5324237.pdf
    • http://files.sobellkarate.com/uploads/1/3/1/4/131437161/befusafip.pdf
    • http://files.maisonsouthernfrance.com/uploads/1/3/0/8/130874575/30855f0ab6447e5.pdf
    • http://files.literaryadventures.net/uploads/1/3/1/4/131438234/dafixoxijeb.pdf
    • https://bixowos236323626.files.wordpress.com/2020/06/62579637403.pdf
    • https://xupunugoj.files.wordpress.com/2020/06/jofezekufedo.pdf
    • https://xudawipopa.files.wordpress.com/2020/06/82758699936.pdf
    • https://nawovod.files.wordpress.com/2020/06/55401173414.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000676d.bin
42f2374fe1128955e49b4193a604fd6dc1dab99e28dbb62a23c23b8d8d43ce4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 5232 bytes
font_01_sfnt_off00007939.bin
d20e9c54c2a02c5bca8e2948cd1469761625191e55d07d86cd8e06d9bee4a72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7939 10336 bytes
font_02_sfnt_off00009cac.bin
692853019131b70357e7dbcd471c4a2a58d3e26703aa6161f913bddf0e5b7bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CAC 16148 bytes

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