Malicious PDF — malware analysis report

Static analysis result for SHA-256 093be8a7c2be91a6…

MALICIOUS

PDF

48.8 KB Created: 2020-08-10 00:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db1124356cd1034c08c454155054267a SHA-1: 4a26c61c1d74848a3b4f7e850d4ffc0ffa151000 SHA-256: 093be8a7c2be91a69f7db0aaa0b78e5b968a3dc2f6060a379cfecec3276cef15
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a tool for reducing PDF size, which redirects to a known malicious domain. The document also features a large number of links to other PDFs hosted on various domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful content.

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.com/pify?keyword=adobe+acrobat+x+pro+reduce+pdf+size
    • http://files.margaretstewart.com/uploads/1/3/0/7/130740561/3452434.pdf
    • http://files.leslievilleschoolcouncil.org/uploads/1/3/1/0/131069897/xokodinewexesa.pdf
    • http://files.daniellessweettreats.co.uk/uploads/1/3/0/7/130776674/pivesadajakevadapo.pdf
    • http://files.eastmallinginstitutehall.co.uk/uploads/1/3/1/0/131070799/gakegutetakewubabo.pdf
    • http://files.groceries-usa.com/uploads/1/3/0/7/130738940/pawoku_munaxusefes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0412/4571/files/92406274701.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/4130891993.pdf
    • https://cdn.shopify.com/s/files/1/0432/1234/1416/files/breathe_on_us_chords.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/banting_diet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/bexagamiwonimubevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3396/0341/files/rodavimekut.pdf
    • https://cdn.shopify.com/s/files/1/0431/5057/3719/files/judefesoretaxowimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40323832667.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5821/files/one_way_anova_spss_output_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/bizobinivaribod.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1688/files/zomeses.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/vail_snow_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7724/files/calculus_2nd_edition_briggs.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/cross_country_ski_machine.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_off000073cd.bin
7e07d635850292095ce0454f05b6b7a1fa0c3b13e6163f0737909b84da05032d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CD 5140 bytes
font_01_sfnt_off0000856a.bin
1abbb7c6fc02c0efb6782d1676dad18bba340990f07c3554778d10efa06fd2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856A 10084 bytes
font_02_sfnt_off0000a7ee.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EE 4324 bytes

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