Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba4c4e9cbf1337e…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 05:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72736657fed7e33e7cbe6b0cca19ac4 SHA-1: 50fa837addae080ef98188fe8fca799c0f8306f6 SHA-256: 6ba4c4e9cbf1337e02f5d971f1308f042a040d753c7eb2856d9408fc2ce0f1e9
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.ru/wix. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a tactic to distribute malicious content or traffic. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence score point to a malicious intent.

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.ru/wix?keyword=mapa+turistico+sintra+portugal+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9321/2827/files/bundelkhand_university_admission_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/gunodukojakujow.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/xonenasojofaxaberoxawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/parezilavu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5451/1766/files/latest_betking_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/merete.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/33830774583.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/nipokunasupokokodulu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/us_military_phonetic_alphabet.pdf
    • https://static.usrfiles.com/ugd/ae059d_888f06bf4c0f4dfaa95eb30b5aeb13d8.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_d2628e29c4f74cb7947b4b5afbb72625.pdf
    • https://static.usrfiles.com/ugd/cac9e4_90fee3d73f0b452a9c5919b13c222d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a30c15573c4d93b5b754f527edbcfe.pdf
    • https://static.usrfiles.com/ugd/aec2ea_ebd8abed09da448596433c149eff5b78.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_fd68ad0151e94800b82ed3a37a852e50.pdf
    • https://static.usrfiles.com/ugd/c63dba_750ed80af9444b13b6507f24498da1dd.pdf
    • https://static.usrfiles.com/ugd/4f270c_88d987712c764321a52fc0dabdc96d3d.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_off000068cc.bin
8f28ec92687ea238930d3d1f6bfae68e4b0c0cd58b4d6b5bdcbe3c54a9a84a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC 5328 bytes
font_01_sfnt_off00007af7.bin
e14d1d0940962f478f7773ddd258bc3c9b09cc92de5a31d80e079f1e4de126cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF7 9676 bytes

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