Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a690f1cd9984dc2…

MALICIOUS

PDF

43.5 KB Created: 2020-08-02 04:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a076d9151bed9a5042ea7ed3be89babd SHA-1: 1dfb788b3c1744ac312364284b29923873e359f3 SHA-256: 5a690f1cd9984dc2aae96b46c47fd1bf3b0ed5c3b989bf7f60798cc9178012f3
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to potentially malicious redirectors like 'ttraff.ru'. The document body, though obfuscated, includes the URL 'https://ttraff.ru/pify?keyword=git+pull+master+into+branch', suggesting a lure to a malicious site. The presence of numerous PDF links and a critical heuristic firing for malicious redirector infrastructure strongly indicates a phishing or redirection campaign.

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=git+pull+master+into+branch
    • http://files.awallowagal.com/uploads/1/3/2/6/132682936/4033094.pdf
    • http://files.bollesrottweilers.com/uploads/1/3/2/8/132815752/c4b7c1c914.pdf
    • http://files.masakoonodera.com/uploads/1/3/1/4/131406391/5538736.pdf
    • http://files.leatherworksfordogs.com/uploads/1/3/1/3/131381374/447c482974f2940.pdf
    • http://files.codeblaque.com/uploads/1/3/2/6/132695741/febikupa-safiboxe-fivami-jikitudup.pdf
    • http:///path/to/repo.git/These
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/99939693718.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/38389761664.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/24810471020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51031200676.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/16381853232.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/iphone_6_safari_crash.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/64667601485.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6678/files/walovugudirer.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/jikemomupa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/jolozumuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/40217660486.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/26062625088.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_off000062b3.bin
97445f9007361e74216a25fd6178409cc0a4c455a12b2d6f29798a2caa6acddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B3 5344 bytes
font_01_sfnt_off000074aa.bin
c46069bc773e91aba7ccde7cf031ef5a7722a24cb81d558de0e3817f55a3d617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AA 13820 bytes

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