Malicious PDF — malware analysis report

Static analysis result for SHA-256 130389ad110348a1…

MALICIOUS

PDF

42.1 KB Created: 2020-11-01 23:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5735d49c7225c0c358cfc2fe1e92e001 SHA-1: 76a92e7326b01c8831f0ba6d1ae05e633fa5dcb8 SHA-256: 130389ad110348a14f1f6efb54ac6bf2a6f10954a1b7bd5dc7f8375799a61541
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results, with the primary link redirecting to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a SEO poisoning campaign to drive traffic to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/123?keyword=wordly+wise+3000+book+7+pdf+download
    • https://cdn-cms.f-static.net/uploads/4418192/normal_5f9e6e5eb0287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/http_injector_pro_apk_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0266/7855/8903/files/sap_pricing_procedure_table.pdf
    • https://cdn.shopify.com/s/files/1/0502/8023/5193/files/60755484314.pdf
    • https://cdn.shopify.com/s/files/1/0433/5304/7195/files/lexus_ct200h_2020_manual.pdf
    • https://uploads.strikinglycdn.com/files/4e34203b-eba6-44bc-bcbf-384aaafed644/setting_of_the_outsiders_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0504/7920/2469/files/81545404872.pdf
    • https://cdn.shopify.com/s/files/1/0433/2473/5643/files/lubavasanatuvesu.pdf
    • https://cdn.shopify.com/s/files/1/0501/4631/2385/files/bayesian_analysis_with_stata.pdf
    • https://uploads.strikinglycdn.com/files/a639abe9-4f61-40a1-bab0-c3059d47d4e2/20650300712.pdf
    • https://cdn.shopify.com/s/files/1/0501/6286/0197/files/17195965439.pdf
    • https://cdn.shopify.com/s/files/1/0429/4282/4614/files/how_to_write_a_disclosure_statement_for_court.pdf
    • https://cdn.shopify.com/s/files/1/0493/2386/8319/files/52028830429.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_off00005811.bin
fd1f4c4d16331e543cd1fb571ea9f49aff3d8f60243362e2aec9a3deb63c50f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5811 5540 bytes
font_01_sfnt_off00006b0d.bin
4ed8134c55c1dc854f1b560232565715f99ba26f8964e1d517d706d9e0f25892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0D 10068 bytes
font_02_sfnt_off00008d90.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D90 4324 bytes

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