Malicious PDF — malware analysis report

Static analysis result for SHA-256 1847c2f2b2e9c298…

MALICIOUS

PDF

44.0 KB Created: 2020-08-13 10:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b0ecbc761a4f31e26862b828b55b3e0 SHA-1: 47c124288be4d4da5c289b2e302bbf1dd33acb17 SHA-256: 1847c2f2b2e9c298ca74107bd3ddb474c762229440428b2c168f773b89db2246
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary purpose is to direct users to malicious sites, likely for phishing or malware distribution.

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=ascaris+lumbricoides+tratamento+pdf
    • http://files.kualalumpur-properties.com/uploads/1/3/2/7/132712005/5539382.pdf
    • http://files.vintagechicanew.com/uploads/1/3/1/6/131636834/kotoletisexese-gabubon-laloxugumis-didone.pdf
    • http://files.fbchawkins.org/uploads/1/3/1/8/131856672/dazopewo.pdf
    • http://files.usmgsol.com/uploads/1/3/1/0/131070845/7c4f23d9232.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/sobivoxinuvozobuboji.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2739/files/elasticity_and_anelasticity_of_metals_zener.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/subtraction_with_regrouping_worksheets_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3074/0135/files/portugues_adriana_figueiredo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/collective_and_abstract_nouns_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/2267/8173/files/89701630985.pdf
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/d3js_heat_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/7922/0891/files/19818530769.pdf
    • https://cdn.shopify.com/s/files/1/0439/8029/2254/files/luseruvafoke.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/addressing_modes_of_8086.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/poly_acrylic_acid_msds.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/8678563139.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/winoxilerudizixadejugo.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_off00006a5b.bin
0919d46897c43234446f830e076b1a95849d456d3eb87c691ea572576252f1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5B 5432 bytes
font_01_sfnt_off00007ca6.bin
d37c8ed312765df059aa139f40b1ad261980c93142968116565cc92013d3086e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA6 12272 bytes

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