Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cb9aa8e73e5ff3…

MALICIOUS

PDF

42.7 KB Created: 2020-08-22 22:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c108eed0517f5440a4ae02ecdc16ea8 SHA-1: 404ba1caec0db0e34e33967c46250ff8b81d19cd SHA-256: 11cb9aa8e73e5ff385deed4958c4ba3256c762ddecaef5e0171809fd53845750
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, which is also present in the document body. The ML classifier strongly indicates maliciousness. The presence of numerous external links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious destination. No scripts were extracted, but the primary malicious indicator is the embedded malicious URL.

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.cc/pify?keyword=bwana+awabariki+pdf
    • http://files.fanfareprints.com/uploads/1/3/1/6/131607712/c5d73bb09a63.pdf
    • http://dokevi.uccbaycity.org/uploads/1/3/1/3/131378898/a95211a0b17e6e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/personal_statement_medical_school_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/ikea_bunk_bed_assembly_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/9230161284.pdf
    • https://cdn.shopify.com/s/files/1/0437/5740/4318/files/balogh_mary_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/dezosebobugi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6192/files/kogatadazowakunivaxoke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9747/3699/files/lufuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/11396042250.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/47179122010.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/83085318492.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_off00006b65.bin
4677fbdc435c101d39705115c2906a6cd0d10d09feabc20048a0b9115f599f93
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B65 5172 bytes
font_01_sfnt_off00007d18.bin
9d3aba112ab32aa3fe885c0592f066470726200d464f850790a4fced4541f06f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D18 9548 bytes