Malicious PDF — malware analysis report

Static analysis result for SHA-256 790cb7030f175535…

MALICIOUS

PDF

37.7 KB Created: 2020-08-08 18:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65c75259f2f6cad06754d31932fb1b22 SHA-1: 07199b2a08fe71b0ba3196037fa4b5764b7e367b SHA-256: 790cb7030f17553562ea56650636d2e25f208d79779f36aeb8b39a3c1ac686e0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, masquerading as educational content, that redirect to a malicious domain. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure. The document body itself contains obfuscated text and the primary malicious URL, suggesting a phishing or redirection attempt.

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=articles+a+an+the+no+article+exercises+pdf+with+answers
    • http://files.rogerhorowitz.com/uploads/1/3/2/7/132710787/854b2e01.pdf
    • http://files.thefurniturelady.com/uploads/1/3/1/4/131407148/betulogoguwudi_rimak.pdf
    • http://kuwof.edessa.ca/uploads/1/3/1/4/131407406/repufabutovuvo.pdf
    • http://files.thebluedaisyandco.com/uploads/1/3/2/6/132681144/pesibogebofidasewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/kuvijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/zubamaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/ca_real_id_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0432/8698/6908/files/fanufoforemamorima.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4283/files/wotivinimitobumesikupusov.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/kogum.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/equivalent_annual_annuity.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/44787603825.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/home_address_in_usa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/25158097251.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/gijuvulanifudisurenizaxig.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/jafivusom.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/kiromukupetineju.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_off000053fc.bin
ce45e012b7c855b68e171839e121e1f47388479109adbdf14ce43d9226e820c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53FC 5392 bytes
font_01_sfnt_off00006666.bin
739f99cd54308be2cd8f01781b1ac54c595dc49ff866a2c63b7e6e4b88078e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6666 10240 bytes

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