Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a90fb0f4bf5608…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 17:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56a2354af5e3e48b55bfcc56a4e30723 SHA-1: b82fb0650a68d37fc70baf4e21debcd78e0a393b SHA-256: 06a90fb0f4bf56084ce901a368914d34b4e7e81b43b9972ce078aa606f026164
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm designed for SEO manipulation or to obscure malicious redirects. One prominent URL, 'https://ttraff.cc/wix?keyword=t%25C3%25BCrklerin+tarihi+ilber+ortayl%25C4%25B1', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=t%25C3%25BCrklerin+tarihi+ilber+ortayl%25C4%25B1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d78803_5d3ab2da6b2a4ad2802db9fdb57fc521.pdf
    • https://static.usrfiles.com/ugd/0c4177_dd21e9b44bab4bc6b19df5b3c42d7545.pdf
    • https://static.usrfiles.com/ugd/c8a981_e0089cde6bbd489992e52568b43d9133.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c4e3d1d74f947e1ae4d67666191a89f.pdf
    • https://static.usrfiles.com/ugd/b8c837_006d5a0a982742478c06803b5a634c69.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc25af426ad04839a74d89c065067bb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_664249c81da44ab2969ba9e06293e833.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e4b7dc14fdd4908b093f5951b182647.pdf
    • https://static.usrfiles.com/ugd/eda9ba_1120793b69874dc3a5970a6f5b67170d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd8c060f0054c4aaf48efed9692b423.pdf
    • https://static.usrfiles.com/ugd/585b1d_061ac7f200ca4da79ffe9594807e4199.pdf
    • https://static.usrfiles.com/ugd/162fe6_318c3363b3604d10a99c5d744a743ffe.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ba8acef18a416eab540a220f16fe61.pdf
    • https://static.usrfiles.com/ugd/b8c837_74e4d4414a9e4fbcaaa3b2f2f2dffb16.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006745.bin
5e5d53ed949b73107201b40c26f8d29d7c7dbf3b16d2eaf196469efd2cf97c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6745 5000 bytes
font_01_sfnt_off00007814.bin
0de153c71b2dba54f7562f37dd3e7fcc43503ce32729006185588a68b6832746
pdf-font-stream PDF embedded font (sfnt) at offset 0x7814 12008 bytes