Malicious PDF — malware analysis report

Static analysis result for SHA-256 8290306b2753a8e1…

MALICIOUS

PDF

46.8 KB Created: 2020-08-09 13:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8732bbb27e6042e67a9bff91a623e223 SHA-1: db1db938e5c5fc307bf66dbd8d134217058c84f0 SHA-256: 8290306b2753a8e1e3c815ee547367d5ac0a284feb9e29ceadc40c0459ca5e2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely for further exploitation or phishing. No scripts were extracted from this sample.

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=metodo+de+arbol+de+decisiones+pdf
    • http://files.fifthelementdefense.com/uploads/1/3/1/0/131071256/pejemoxotikamu_fopekonogasoko.pdf
    • http://files.backtobal.com/uploads/1/3/1/6/131606261/zazavunexo_wezuxukadunip.pdf
    • http://sozegol.cozycamperrentals.com/uploads/1/3/1/0/131070374/2571696.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/tofidefunamigudevizuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/wejanomijugibebipubenexor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/mifovovidolatanimijeraruk.pdf
    • https://cdn.shopify.com/s/files/1/0435/7508/3171/files/kalufiludi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/62615607961.pdf
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/zuvogofaputevixigebugeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/naray_information_communication_enterprise.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/technical_analysis_for_the_trading_professional.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3959/files/76493885476.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixet.pdf
    • https://cdn.shopify.com/s/files/1/0428/8852/8035/files/addison_disease_article.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006752.bin
7352ba8d67d1957de0409e3cdce0a02a894f5ce3942143c5546f927234908544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6752 5080 bytes
font_01_sfnt_off000078a0.bin
011f36b34162acf49215c6744e8559242cb155bd952c367b9c9a37aebd8b94c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A0 11724 bytes
font_02_sfnt_off00009eb3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB3 4324 bytes

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