Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f90a2665546ee04…

MALICIOUS

PDF

42.1 KB Created: 2020-09-01 19:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e0230c8bac9d4e9189d11bb2805c8f2 SHA-1: e7974f1908357564267e2a466d289c5f9ef6fdbd SHA-256: 4f90a2665546ee04a7d15bddb726429d7803313875f25701f8d14801f0bd6589
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'cryptocurrency wallet app android' and the malicious URL, suggesting a lure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the malicious nature of the ttraff.ru URL, which is likely used to redirect users to a phishing or malware distribution site.

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.ru/wix?keyword=cryptocurrency+wallet+app+android
    • https://cdn.shopify.com/s/files/1/0430/2703/8371/files/26904937208.pdf
    • https://cdn.shopify.com/s/files/1/0432/3278/8648/files/45103078957.pdf
    • https://cdn.shopify.com/s/files/1/0428/3885/1751/files/enzyme_reactions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7811/files/vuzimogenapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/transformations_on_coordinate_plane_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/movojimemajodizewiji.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/29553311094.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/51565297035.pdf
    • https://static.usrfiles.com/ugd/c836c3_03dacb1556664e35ad66a71de0e35616.pdf
    • https://static.usrfiles.com/ugd/0d2908_b6fdcaf9fcf84afbb8708fac6c6b3d71.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a282192d5b547dc8f8b15377f390ed8.pdf
    • https://static.usrfiles.com/ugd/1df9ea_aee250fdbad243558f139b8538cff383.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9b8e2d6641343489e16d1e6645c7033.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/duvevofudonuwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/berkeley_three_dialogues_between_hylas_and_philonous.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/awadhesh_premi_ke_bhojpuri_video_2018.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/18880270572.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/74201366920.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000647d.bin
76da0202322233a291954135c13e913d0990e93ce2e73a98d69f92f687a6b865
pdf-font-stream PDF embedded font (sfnt) at offset 0x647D 4988 bytes
font_01_sfnt_off00007596.bin
1662670487fe7c41b8ab3c0d08a084903631f5a4b6e763bac385657afe37755e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7596 11036 bytes