Malicious PDF — malware analysis report

Static analysis result for SHA-256 a725b5c5134f09b0…

MALICIOUS

PDF

54.2 KB Created: 2020-07-17 03:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50da408fefdd08fb51f62fe59321ebe6 SHA-1: d61f21086cb3b76c93b0e71d9d2cf81349d4d2ca SHA-256: a725b5c5134f09b0c2470778b1b33e5bcb066c490bddc92143ba3d250243dc7c
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary URL, 'https://ttraff.com/wb?keyword=application%20letter%20example%20pdf', is identified as a malicious redirector. Another heuristic indicates a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0432/6083/8050/files/gigatuvatan.pdf' being one of the linked PDFs. The document body, though heavily obfuscated, appears to contain metadata related to application letters and PDF generation, suggesting a lure.

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/wb?keyword=application%20letter%20example%20pdf
    • http://files.charlevilleperformingarts.com/uploads/1/3/0/8/130814337/domireliwafutodej.pdf
    • http://files.twohandsrescue.org/uploads/1/3/1/4/131407877/18d68b9c.pdf
    • http://files.coolmedicalspa.com/uploads/1/3/2/6/132681210/7482581.pdf
    • http://files.artslcc.com/uploads/1/3/0/7/130776142/32ae9a02.pdf
    • http://files.thebody-mechanics.com/uploads/1/3/0/7/130775752/rajodawudezete.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/gigatuvatan.pdf
    • https://cdn.shopify.com/s/files/1/0428/8721/7311/files/42382750482.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/2440530060.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/64226830991.pdf
    • https://kojesurobiza.files.wordpress.com/2020/06/banofunifarivaroromiji.pdf
    • https://jurovofat.files.wordpress.com/2020/06/74467692418.pdf
    • https://robepeler.files.wordpress.com/2020/07/gowuguvat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/71520421160.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/vavojojotegox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdf
    • https://cdn.shopify.com/s/files/1/0434/7854/8630/files/56775874758.pdf
    • https://cdn.shopify.com/s/files/1/0430/9113/2567/files/47235144539.pdf
    • https://cdn.shopify.com/s/files/1/0434/1307/8174/files/31019610487.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/mejizelomerelunorotuwuxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/23340907916.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000960a.bin
d789435ab0fa9a8f3d0c001b839253e9df532781a3b9d6ed8d565dfef6771754
pdf-font-stream PDF embedded font (sfnt) at offset 0x960A 4968 bytes
font_01_sfnt_off0000a6cc.bin
0bac7bbd4b4d30552a9a5245d0c461c3a2ea64451caf9e41efa24085c1801236
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6CC 10612 bytes