Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bae140a0aa4ac4…

MALICIOUS

PDF

45.8 KB Created: 2020-09-14 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b92f80797f06da24a5d4d5850c2ede6 SHA-1: ec279aefbae28fe664b0429f45ce897179f75a34 SHA-256: b8bae140a0aa4ac455d61b8cf73fab7c9006d14b03c6c3f6881f6d189b409ab7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to a link farm designed to redirect users. One prominent URL, 'https://ttraff.link/pify?keyword=finding+forrester+worksheet', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to disguise the 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.link/pify?keyword=finding+forrester+worksheet In PDF document text
    • http://files.nlg-pros.com/uploads/1/3/0/9/130969910/katixiratowapo.pdfIn PDF document text
    • http://kabemefo.maydwellarts.com/uploads/1/3/1/4/131453574/tixidenetojupa-xoxanesarevimom.pdfIn PDF document text
    • http://kewiwip.am-tecsecurity.com/uploads/1/3/1/1/131163635/2233324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/0049ca_0bb61a35df0948dea0a887201d0c110a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0e6328_57160aabda164cb7beda4e5fc4acafa9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/837d34_1e0391cc12094cd6b826a34ef11fdbcb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b16523_4a815009a10449ddb4bf3d5bcb949240.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/285be4_c53a844dbfe943e88add769564bc214e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9f6a24_c900da141ff54487af532be49a170a84.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/205ae4_2db5327652554792ada4d6fcf57bf795.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/63028190208.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/pelicula_completa_it_en_espaol_lati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9300/7272/files/96725238020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/badim.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7652 5040 bytes
SHA-256: 192f1930bd4e3f78daab1382e0cb7455551b89c7036038b7070dd27c9d5c960d
font_01_sfnt_off00008791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8791 10248 bytes
SHA-256: f28d8a2821639ab4d092956f3b7bf45fa81710dd4567226e93ba587b79dd53ee

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