Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a447602409d1df8…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 18:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eeb1f213e8c4e658879ba45751a4111 SHA-1: c098823ba0b919a80fce5000125c5d3b9622e0de SHA-256: 5a447602409d1df8639af949406d94dee0d1a0770eeddd714eb8ffc61da20ff2
154 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a link farm, embedding numerous URLs, including one pointing to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute malicious content via a large number of external links. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=the+oxford+handbook+of+functional+data+analysis+pdf
    • http://files.belindabucknell.com/uploads/1/3/1/3/131378975/tiborejotaxis.pdf
    • http://files.cookiesthenmilk.com/uploads/1/3/0/7/130776757/f9d1d9583f.pdf
    • http://files.zetastatedkg.org/uploads/1/3/1/0/131069832/fifazajonenekade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/57323911191.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/wafuwagedemu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/business_plan_sample_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/aspiration_pneumonia.pdf
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/79669998034.pdf
    • https://cdn.shopify.com/s/files/1/0431/8943/6580/files/rosodej.pdf
    • https://cdn.shopify.com/s/files/1/0428/6152/7206/files/exercicios_tabela_periodica_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0428/5458/0390/files/social_anxiety_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/modern_calligraphy_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8921/files/goborobetuwena.pdf
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/effects_of_childhood_obesity.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2216/files/36060840032.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/58397411318.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_off0000684d.bin
c2696e49cfb1294e668d208538f335d4a799a3fd76e2f12f41a1a252320055ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684D 5564 bytes
font_01_sfnt_off00007b40.bin
e02842b4284f0a87694a35cac9c702c6a6b6df98e90600b5aa8d3ba3bd13348c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B40 10552 bytes

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