Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f4f554937266f9…

MALICIOUS

PDF

38.4 KB Created: 2020-08-30 22:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc4179fba18d900c09868dda3d00f8c5 SHA-1: c912d8f587ffa327c2f844ffae1378a54de6ce70 SHA-256: 66f4f554937266f93bfae38d40f5d02e828b82d67f27ab8b1c5fe3dd166fb276
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=portable+high+frequency+lz-006a+manu, is identified as a malicious redirector. This suggests an attempt to direct users to malicious infrastructure, likely for further exploitation or phishing. 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=portable+high+frequency+lz-006a+manu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6300/8661/files/order_of_adjectives_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/tumesugefodakawuzamiwupo.pdf
    • https://cdn.shopify.com/s/files/1/0465/1204/6230/files/old_man_river_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5976/files/geometric_proofs_practice_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/woputapejasazewimal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/kusidixewepuzor.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/60149537157.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b2644d78f39464fa3d97d8f0891de10.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_7d253c3564fe4415bca63d827f0f731d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6e6c3af0e04fbc8a3a456fb6f199ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dca233853b44c6e80c6aa52ceec16bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf05ce16c7674097a1f1da5467c5178b.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c369762975a41ddad84b8131cc23851.pdf
    • https://static.usrfiles.com/ugd/b8c837_30e5cc5025a64bebbebfacf31c504f08.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_off00005531.bin
dcad6d51a0dfdf3a12a18353a8dd4f04cda9d1a5ad63bcb720aaaf56b13cd196
pdf-font-stream PDF embedded font (sfnt) at offset 0x5531 5864 bytes
font_01_sfnt_off00006915.bin
a2a87abca482c8a76a55c300b802945d5683515a0736110b565369693edcc7fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6915 10592 bytes