Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5aa597d733ab50…

MALICIOUS

PDF

30.1 KB Created: 2020-10-04 05:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a3dd1de93b97d00579bc1ba02eaf4cbd SHA-1: 05a610efb1bc7a3ce4e6e148f5263457fce16b82 SHA-256: ed5aa597d733ab50646feed562843c0ad2afdd58a01f5a15e580f29eb193aab0
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/strik?keyword=formato+certificado+medico+dif+pdf', suggesting a lure to a malicious site. The presence of numerous other PDF links, some pointing to benign Shopify domains and others to unknown domains, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gettraff.ru/strik?keyword=formato+certificado+medico+dif+pdf In PDF document text
    • http://senuw.ailiniwan.com/uploads/1/3/0/7/130739964/2538783.pdfIn PDF document text
    • http://files.skinsugarrx.com/uploads/1/3/1/4/131454093/raluda.pdfIn PDF document text
    • http://zeropivax.canberracelebranteileen.com/uploads/1/3/0/7/130776406/kabisapeme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5293/3018/files/clifton_park_hospital_orthopaedic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3572/1628/files/96114840606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4882/8065/files/power_8_workshop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5648/6807/files/bosch_glide_miter_saw_12.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8091/1515/files/the_commandments_word_whizzle_search.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4075/4842/files/52565653005.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/knowledge_management_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4355/6008/files/nancy_cott_public_vows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0936/2085/files/sozobutezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec11249-190d-4a10-9bb1-2f12049717e5/54568239048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e6eb1e-8571-4ee5-8f1c-4351b48aea7d/59870918126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde18ab6-4b98-44e6-a7d5-120534f0b41b/18916240784.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4F 5044 bytes
SHA-256: 41e5fd2b6c60089c91eea636015e307c2fd7667cb8879f4c611d61e63dd8a0c3