Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3547837d6f1d05…

MALICIOUS

PDF

37.3 KB Created: 2020-08-20 05:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 007d4eae7cab04f6ea9346606ce04839 SHA-1: 140b15ff4454b74c74a6208ca0af77899c5add4a SHA-256: 4a3547837d6f1d05d5106887c3d0a4780c4efc495d7874b7f7429c1a88b7291a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL for the malicious redirector. This suggests the primary purpose is to lure users to malicious infrastructure, potentially for further exploitation or credential harvesting. No scripts were extracted from this sample.

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=row+canonical+form
    • http://lagojitit.kabloomgroup.com/uploads/1/3/1/1/131164250/62b7525.pdf
    • http://jetoma.theartofhump.com/uploads/1/3/0/7/130775045/wonikinejuxune-benukaliv.pdf
    • http://roniwinox.poplarbluffdancestudio.com/uploads/1/3/1/3/131398394/lagunafumowabeje.pdf
    • https://cdn.shopify.com/s/files/1/0436/5549/5833/files/72569025173.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/sajesuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4591/2727/files/amebiasis_hepatica.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/35882233974.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/77580752166.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/17505293156.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29942388251.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0762/files/i_m_a_believer_shrek_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/auditoria_financiera_tesis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9930/8700/files/74113601546.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/89831326410.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_off000054c3.bin
0efce96dc1d1b722e86ac991ae94965670f5ce8b66bb9a79fe1fb2899bfcdb44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C3 4948 bytes
font_01_sfnt_off0000658b.bin
9eecafc64c0d7ce6d6e80172654ba715807c60a70b451e7cbf43c56a8e93f9a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 10400 bytes

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