Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eba83f1b1764676…

MALICIOUS

PDF

43.3 KB Created: 2020-08-05 14:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e502f62f196152162e868978dd5c1d SHA-1: 0b75ede1a8dae7e28060d3363caa7906c326b196 SHA-256: 5eba83f1b1764676b01aa05f8781669c36cfc6e399a0da6b7e4b8ef58e9b10c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, a common tactic for SEO manipulation or distributing further malicious content. One of these links, https://ttraff.ru/pify?keyword=dom+angielski+%25C4%2587wiczenia+dla+dzieci+pdf, is identified as a malicious redirector. 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.ru/pify?keyword=dom+angielski+%25C4%2587wiczenia+dla+dzieci+pdf
    • http://files.mywisdomboard.com/uploads/1/3/2/6/132695575/625417.pdf
    • http://files.vivafitnessshepperton.co.uk/uploads/1/3/2/7/132740593/5a7d8fa8c5.pdf
    • http://files.sheperforms.com/uploads/1/3/1/3/131381518/pukokefil.pdf
    • http://files.mistressakella.com/uploads/1/3/1/6/131606275/wanugomojupobiz-xufedalosopas-dawowoma-nubakuxaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/11416990884.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/wakorexujabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/funutojukogobalefobakeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/font_weight_bold.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/l_appareil_genital_feminin.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/zedinenilime.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85755015361.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1661/files/doodle_god_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25843483079.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/50848710074.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/62559454566.pdf
    • https://cdn.shopify.com/s/files/1/0429/4836/2399/files/wenetize.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_off00006590.bin
2bee77eee1d2782f7a154501aab9fba8acd1e94eb855d3c1b19387179f4134e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6590 5720 bytes
font_01_sfnt_off000078e2.bin
4f476fd8fa3646ac8792ae91b0fa5e25ce3c2fd24cf773240ca95d7590812859
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E2 11892 bytes