Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d3321b640f1ff3…

MALICIOUS

PDF

49.6 KB Created: 2020-10-31 13:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a216516a9d86bce5e1ef7dbdc20d3cd0 SHA-1: 58b75ffa8c1a89a67d75e08c96091a42110bde1b SHA-256: 05d3321b640f1ff3be1bf037176f4993c64f68f7e26bfdb6f64e2b63ed0f7052
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, https://cctraff.ru/aws?keyword=unit+5+ap+world+history+study+guide, is flagged as a known malicious redirector. The document's content appears to be a lure, disguised as a study guide, to drive traffic to this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cctraff.ru/aws?keyword=unit+5+ap+world+history+study+guide
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/doditaronusajo_wufibosokabedix.pdf
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f8b46c6eaf2f.pdf
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f875e83d710b.pdf
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/dodelul_mobuje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dobesogum/apologetica_cristiana.pdf
    • https://s3.amazonaws.com/daselex/rodavajufiv.pdf
    • https://uploads.strikinglycdn.com/files/374ebaf7-a3c5-4678-aa84-9c9de398f594/pegeperefuladokiwugisoto.pdf
    • https://uploads.strikinglycdn.com/files/3a6b0790-39ed-47e7-92e7-8b59643b3388/77340118147.pdf
    • https://cdn.shopify.com/s/files/1/0501/4772/1397/files/6287282600.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/57169864471.pdf
    • https://s3.amazonaws.com/baxunaf/65886293975.pdf
    • https://cdn.shopify.com/s/files/1/0488/1219/6005/files/pre_and_post_test.pdf
    • https://cdn.shopify.com/s/files/1/0499/3128/8734/files/implement_load_more_recyclerview_android.pdf
    • https://s3.amazonaws.com/dukexajuj/japeva.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085d4.bin
f849c7d4717b566e46618ddfb392a79e9ed58cc49d943c8b1b84b7cc43e503e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D4 5528 bytes
font_01_sfnt_off000098aa.bin
0e67e800b25224dfd738975a8cbdbb5642857964ac5a2962366ba6bfc4043ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AA 2860 bytes
font_02_sfnt_off0000a4d3.bin
a195f46b20d183ae3da59166043b41040ceec0ba7f44cd6aeb9ee6c04e7043e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D3 12620 bytes

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