Malicious PDF — malware analysis report

Static analysis result for SHA-256 623a03a1f78cc0a1…

MALICIOUS

PDF

39.4 KB Created: 2020-08-29 23:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d30609a607f52b30a43215b64c4ac87 SHA-1: 2eb93f18e66474fba1912326cb9b440670227ba7 SHA-256: 623a03a1f78cc0a1aa8d4bd0ff914dc0e875ace16f745abdf7486543ce933ea6
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL within the document body is a strong indicator of a phishing or malware distribution attempt.

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.
  • 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=inch+fraction+to+mm+table
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1033/2571/files/duty_of_care_in_negligence_tort_law.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1164/files/un_barrage_contre_le_pacifique_incipit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/baking_sheet_with_rack_set.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7330/files/19093582825.pdf
    • https://static.usrfiles.com/ugd/b8c837_a510631e1bd34398915a53193dc1429b.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/geankoplis_transport_processes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/shyam_bhajan_mr_jatt.pdf
    • https://static.usrfiles.com/ugd/b8c837_f94ba408e5774401aeaaa9c15923d862.pdf
    • https://static.usrfiles.com/ugd/74e905_350491771d4d4faab65efec6ad077aa7.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_off00005fda.bin
3d41eed53bfc682bc5a104ffbc2ea0234bcdbec8c5ea82d709f230b5ba402d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 5020 bytes
font_01_sfnt_off000070b3.bin
88ee4f4ab6bc5972ddd9114a8efb1e1cbab86ec6aa6f98c7d357fc90a05f92e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 9656 bytes

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