Malicious PDF — malware analysis report

Static analysis result for SHA-256 61155ca190aaa984…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 23:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7542fb775fff8d8f23a95ac47fc1c73 SHA-1: 1ff5f316a915315aea839e0609b8f8ad344cf5d2 SHA-256: 61155ca190aaa984e3017f04d52a24d160e4a064e63c8044dba77641c6f74c4a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One of these links, https://ttraff.ru/wix?keyword=livro+candombl%25C3%25A9+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this malicious URL, suggesting an attempt to direct users to malicious infrastructure. The presence of numerous links and the identified malicious redirector strongly indicate a link farm or phishing lure.

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=livro+candombl%25C3%25A9+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/agenda_2020_em.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/310_b_power_lunch_trilulilu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/49217035317.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_dc8d05c0b8204608abaddefeb6e3e618.pdf
    • https://static.usrfiles.com/ugd/0047a4_3b30032b224d44239a6707898d6621eb.pdf
    • https://static.usrfiles.com/ugd/07625c_76bec8b2455b4d1da8e820c9bd722a57.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7a857dc0c504b479524203800e8996a.pdf
    • https://static.usrfiles.com/ugd/32777b_cd3adc6d2f2144729ef415ae7b247aba.pdf
    • https://static.usrfiles.com/ugd/4dd980_0fae4cc257a64c6d89446dfd7f8e9964.pdf
    • https://static.usrfiles.com/ugd/b8c837_90f3194e6bc64949924889cee6bf18be.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a9ccaf4b064448a86884bd602857cf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5444f467fc5a44e5adaaa0d161119b7f.pdf
    • https://static.usrfiles.com/ugd/b47706_90d42e842d5b46f8a4d44e3fd9549654.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/cambridge_english_advanced_2_examination_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4355/files/42016271064.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/jujitogej.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_off0000661f.bin
7e624dd6c76b9c683580c074e330988b98242640c7c0227d934ccd7629fa43f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661F 5404 bytes
font_01_sfnt_off00007825.bin
73582a945dc38cb75df97c5bdf7a1054f2744057e76a558de74d2e5c72433452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7825 11576 bytes

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