Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f7c0dedf929c13…

MALICIOUS

PDF

35.1 KB Created: 2020-09-20 00:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0529b20a9bbfbe74f1316a0efa4af4e0 SHA-1: d618ea38a3752a03db195df560a3cd05a8a00eff SHA-256: a5f7c0dedf929c13e8efe472c2635a5a9fd569f2e8044ecbe2132a4812f1184e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=science+data+tables+and+graphs+worksheets'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=science+data+tables+and+graphs+worksheets
    • http://sinumer.tidalmoonmusic.com/uploads/1/3/1/8/131856097/simuf_naruveb.pdf
    • http://lufojobab.gcwellington.com/uploads/1/3/0/7/130739048/1985440.pdf
    • http://didijanu.throughthereddoors.org/uploads/1/3/1/4/131412032/1a784d4cc70ec.pdf
    • http://pekixa.houstoncalligraphyguild.org/uploads/1/3/0/8/130874379/c60ad5.pdf
    • http://gunavux.jenroweaicp.com/uploads/1/3/2/7/132741100/bapimoj-didivopefum-sapiduraju-wiwejakidexof.pdf
    • https://cdn.shopify.com/s/files/1/0449/8112/5278/files/21359713411.pdf
    • https://cdn.shopify.com/s/files/1/0440/3858/6518/files/actuarial_tables_uk.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/apple_itunes_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tomazemajetel.pdf
    • https://67505f48-ee51-4127-a1a3-5d35c1ac5263.filesusr.com/ugd/30e015_f5622395253d45b3924882fb97fdd812.pdf?index=true
    • https://55cd38ab-cc2f-4ab8-9e9a-181ad073084b.filesusr.com/ugd/3a38e0_63d9a1e4d496425baf055bf406b567fc.pdf?index=true
    • https://bbcd95d4-54f1-4cac-b1f1-190825d4c5a3.filesusr.com/ugd/d01287_c5546e7a27ab4e3c873af3af8382c36d.pdf?index=true
    • https://346b561f-87bc-47e4-9866-3eba9aa49029.filesusr.com/ugd/89c6ad_ddac6726d3174104a5d2069adcc8c675.pdf?index=true
    • https://d21a9fee-59da-46a0-8593-85ffb999730c.filesusr.com/ugd/f91cf1_6961d406df84467bb6d9d836c45d211f.pdf?index=true
    • https://d8e9e56f-58ad-4580-834a-cf5c820177db.filesusr.com/ugd/6f9b04_6532c0430da84ec08b5bd374d8acb7a8.pdf?index=true
    • https://3161a6d4-4ef7-4a85-8822-2a470eeb35a5.filesusr.com/ugd/865d50_2d3897a647ab461da8d4104313466aba.pdf?index=true
    • 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/
    • https://3161a6d4-4ef7-4a85-8822-2a470eeb35a5.filesusr.com/ugd/865d50_2d3897a647ab461da8d4104313466aba.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a8e.bin
fa9ec451d6268ca9aeb589c9f28c8d39e3c894b4e47b8651a9913c3948f6577f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A8E 5736 bytes
font_01_sfnt_off00005e0f.bin
fadcd8240ed6965d99295b6489711d3032190c10e58ff86547501f85770953e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0F 9836 bytes

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