Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51cf8091a3718c6…

MALICIOUS

PDF

47.0 KB Created: 2020-08-14 13:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1fb6780317a093f601c4c07ea958c73 SHA-1: b5d21771a1cf22f997abd6c75e612d1e15ef52b8 SHA-256: c51cf8091a3718c653b44e33ed2f3fc0991d532e718bbc7de314e6cb4b4be8b4
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text referencing a 'rosary guide' and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO manipulation or distribution. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wb?keyword=rosary%20guide%20with%20mysteries%20pdf
    • http://files.splitdecisionimprovcomedy.com/uploads/1/3/1/4/131453950/b3ebb8611ac.pdf
    • http://files.sweetnnaughty.ca/uploads/1/3/0/7/130776745/fuwerav_gozamomaraj_fogowas_dibumuxesiw.pdf
    • http://files.shirleypeppersart.com/uploads/1/3/1/6/131606874/9198794.pdf
    • http://files.insonify.com/uploads/1/3/1/8/131857758/zamoxizunezalix.pdf
    • http://putifal.ojrbandmpo.com/uploads/1/3/1/3/131383790/joxipiduvumabizigij.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/10541007144.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/rovalemekowadapevoxiruvaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/sufekomagarob.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1146/files/beliefs_of_hinduism.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/bufugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/pugonelawarezabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/36509347226.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/master_microsoft_excel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/55500873620.pdf
    • https://cdn.shopify.com/s/files/1/0452/5355/8434/files/annotated_bibliography_example_purdue_owl.pdf
    • https://cdn.shopify.com/s/files/1/0440/1440/3742/files/sotepapajuzebewalig.pdf
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/pofiweguwepotogajune.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_off00006916.bin
5d2c2c7ef457a686f137c83070184a6301a0c869843f6cf06bd85da7f7b59330
pdf-font-stream PDF embedded font (sfnt) at offset 0x6916 5624 bytes
font_01_sfnt_off00007c2e.bin
1a30ffad343f41ad933d4c6f286a80144b4fd41ad45f1e53be59207a03e8d492
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 6524 bytes
font_02_sfnt_off00008d4e.bin
60fffff6aea6dc62d6e79c3da131bd54613642081acfa789e752c9be44f3f1cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4E 9788 bytes