Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b17812c52ae1dfd…

MALICIOUS

PDF

41.7 KB Created: 2020-09-05 11:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a09b73d8337af8ec8ddf2d4afbbbe7b SHA-1: 90c12bef26211f84ad551c69dbc011b0fa4edbee SHA-256: 6b17812c52ae1dfdfa24e9b68d29b06b80377721a5f3b73f586201a9f42f54f5
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, ttraff.me. The document body, though heavily obfuscated, contains text that appears to be SEO-related keywords and a URL that is likely part of a link farm. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the overall structure suggest an attempt to drive traffic to malicious infrastructure, possibly for phishing or malware distribution.

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.me/wix?keyword=botryoid+odontogenic+cyst+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8483/1125/files/87111679610.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/37670670949.pdf
    • https://cdn.shopify.com/s/files/1/0440/2203/8686/files/b_q_polythene_dust_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0452/6755/0370/files/vexofumokurep.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/angularjs_admin_template_themeforest.pdf
    • https://cdn.shopify.com/s/files/1/0459/9942/3647/files/public_grievance_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/zimozexoweretu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7087/2995/files/20134400896.pdf
    • https://cdn.shopify.com/s/files/1/0439/2140/8168/files/46797628107.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/pumogenimuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0525/4566/files/49901584749.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99744184538.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/jasokasivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4839/files/magical_balloon_overlays_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0156/files/25256593477.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/28374583584.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_off00006271.bin
80d9caebb5e014770aecb4c44984707a6ba45e94a2db6e6ef1b99528724b73e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6271 5232 bytes
font_01_sfnt_off00007464.bin
fb3eecd74ac85743df1fe3b3fb565226d4923a886f4f9fe483a39a57634aab26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7464 10668 bytes

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