Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd98f813938c67f5…

MALICIOUS

PDF

47.8 KB Created: 2020-08-21 15:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af554d55e2fa1aa90d5a1f88b3017aea SHA-1: f89a8b2d8b5273f6679d5ba423c62de7516fc5aa SHA-256: cd98f813938c67f57a3b2356fdf5542d445b8f69f6ecda5eaa0d5b5243b1fce4
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, pointing to ttraff.com. Additionally, it features a link farm of external PDFs, as indicated by PDF_SEO_LINK_FARM. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via the embedded link.

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.com/pify?keyword=brevet+maths+2019+pdf
    • http://files.tosharollins.com/uploads/1/3/1/6/131607232/jodoxajupada-popeb-sujedoz.pdf
    • http://files.1600charlestonregionalparkway.com/uploads/1/3/0/9/130969498/d2436f4.pdf
    • http://files.ggsweetmagnolias.com/uploads/1/3/2/3/132302995/deder.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/canelo_vs_kovalev_live_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/2001_ford_f150_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/pagukuruwozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8081/8581/files/sesovujopitilid.pdf
    • https://cdn.shopify.com/s/files/1/0447/9080/8727/files/contoh_dokumen_amdal_hotel.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1742/files/fesogufuwana.pdf
    • https://cdn.shopify.com/s/files/1/0432/4225/8587/files/fosovizedipukojarolupito.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_off0000662e.bin
5f35f62ffc8bc224dc9e19d2a320b9b630cf408fb739a3824bc6aca4720c0be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662E 5840 bytes
font_01_sfnt_off000079f4.bin
dd3ec0e80a1b81b34e2aa1fd20edec017204fda54f812c64f61024756f4875d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F4 10492 bytes
font_02_sfnt_off00009dbb.bin
4b47a0263681cb2dd466a2827ad63b6db367b292738828c8787e0c1840093280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBB 16148 bytes

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