Malicious PDF — malware analysis report

Static analysis result for SHA-256 28efda24f81d4e7c…

MALICIOUS

PDF

34.7 KB Created: 2020-11-03 07:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd90b484fbef8c2e1931f90d7282f4f SHA-1: f6b05e397e8574a93810878896c636e56d323a53 SHA-256: 28efda24f81d4e7c01b65fe448ef341b1b73ec53793d59a56e65d72a0d27809d
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://ggtraff.ru/aws?keyword=business+concepts+samples'. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, some hosted on Shopify and AWS, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/aws?keyword=business+concepts+samples
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5f8d1299bcbeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0508/2071/0583/files/swtor_republic_flashpoints_in_oer.pdf
    • https://cdn.shopify.com/s/files/1/0503/6448/1693/files/the_official_sponsor_of_birthdays.pdf
    • https://s3.amazonaws.com/pazovugal/anestesia_general_inhalada.pdf
    • https://s3.amazonaws.com/jezaxojipevu/trieu_barber_shop_fairfax_va.pdf
    • https://s3.amazonaws.com/bagisi/portal_flash_version_online.pdf
    • https://cdn.shopify.com/s/files/1/0502/4913/8356/files/66853513661.pdf
    • https://cdn.shopify.com/s/files/1/0497/5381/7252/files/oculi_omnium_whitacre.pdf
    • https://s3.amazonaws.com/kavitokolezub/xijiwepofewinedo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e5a.bin
e374a942cc2b371a8d122b817b7094ac90a3a210d3597f91a298bb0d15b20fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 5032 bytes
font_01_sfnt_off00006f6c.bin
b49a4f3b8edd152e0b82dba0908efe7a0f160bc83d6b843fbdc374ead628064f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6C 9692 bytes

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