Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a37c6d0b4ca790…

MALICIOUS

PDF

46.7 KB Created: 2020-08-12 18:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f17f8cacb5b85831b889efb5f481f9d7 SHA-1: 3d521d2326a34c09c5211c23c7750d9ac92b33ad SHA-256: f0a37c6d0b4ca7909e1bcc677297d684958c31b877138ad296c9bec4de3de6a7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, with the primary URL being a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and numerous other links hosted on Shopify, likely to obscure the malicious destination. This indicates a link farm or redirection attack designed to lead users to malicious 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=projeto+alimenta%25C3%25A7%25C3%25A3o+saud%25C3%25A1vel+ensino+fundamental+pdf
    • http://files.faithforinternationalassistance.org/uploads/1/3/1/3/131379042/6188557.pdf
    • http://mefikur.wlu-science-chem-halabadleh.ca/uploads/1/3/1/4/131407995/db8fa8831.pdf
    • http://files.ayishamoss.com/uploads/1/3/2/7/132712003/4406568.pdf
    • http://files.ottertotsplayandlearn.com/uploads/1/3/2/6/132681233/7917d27315f.pdf
    • http://kibusog.daily-donuts.com/uploads/1/3/1/4/131438268/xunizisep_fodelugozivixul_febivosigo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/gatutovikikozexunibog.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/dedifusiwepaxev.pdf
    • https://cdn.shopify.com/s/files/1/0434/1664/9890/files/65722513385.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vekedexixerokasadoboma.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/zipuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4618/2822/files/16730014620.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/vodalininevurotilaliwupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/mibowuwutunezi.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/86845574708.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4847/files/exercicios_nomenclatura_de_alcoois.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/less_than_or_equal_to_in_latex.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb2.bin
ca54506de69b5e82cf2533690da89ce0f969d729ea4f3ef4e49f55142e9466bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB2 6056 bytes
font_01_sfnt_off00008311.bin
81d1cd9cbcf7efc3338d852ad0ae39cf774721dd696bfd659d83ffb56fa39b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8311 13408 bytes

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