Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f65736a0955577…

MALICIOUS

PDF

43.2 KB Created: 2020-08-09 23:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f733c14c7cc15d99734c578372e92484 SHA-1: 1fce77370ee40e14d4bdc37f2afe19c7d98ef5e6 SHA-256: 62f65736a09555776d2a3021b80e86f4e871a908770811d3464e1a54c2fe8e74
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to what appears to be a link farm designed to host numerous PDF files. One of these links, https://ttraff.ru/pify?keyword=agente+oxidante+pdf, is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to malicious infrastructure.

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=agente+oxidante+pdf
    • http://files.309punkmuseum.org/uploads/1/3/1/8/131857445/dupebolafazodezizela.pdf
    • http://files.hermanworks.com/uploads/1/3/1/4/131407148/farobamobabum_mifotedopa.pdf
    • http://files.positivepyramidprogramming.com/uploads/1/3/1/4/131438499/1e354bb5fbdb14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/panokokovubibabajavukaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6503/files/94399250471.pdf
    • https://cdn.shopify.com/s/files/1/0440/7446/7478/files/quality_assurance_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/39259896015.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/pefowizirofupiruv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4220/9945/files/life_selector_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/amazing_grace_my_chains_are_gone_key_of_d.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/malogaxepitivewakirukipup.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/89810754977.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/12168471784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3162/files/83138592343.pdf
    • https://cdn.shopify.com/s/files/1/0429/6091/2537/files/shortwave_diathermy.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_off0000675e.bin
965ffd99a83daec5da47338d24c76a769a1212412965eec861c111ebf9f72a19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675E 4960 bytes
font_01_sfnt_off00007864.bin
84b7bc0fbe41715aa9c526e076dba96c92723dce36a973539ddbe8953d65f06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7864 11804 bytes

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