Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66109ad9b684b3c…

MALICIOUS

PDF

45.8 KB Created: 2020-08-12 10:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c864c504c26ad886f0a3717fcbdf323b SHA-1: 942fd0a9d4cf328ae061d79262acd3e8c1fb6eb5 SHA-256: b66109ad9b684b3c371b827e7f0f917ee6c22eab047348ddfa0eee6bf8420c61
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=rustoleum+spray+paint+sds+pdf, which is flagged as a malicious redirector. The document body itself is heavily obfuscated but contains references to the malicious URL and other benign-looking Shopify links, suggesting a link farm or SEO poisoning tactic to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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=rustoleum+spray+paint+sds+pdf
    • http://files.mezzinophotography.com/uploads/1/3/0/8/130874451/d35cc08f7d8e8.pdf
    • http://files.almadartebio.org/uploads/1/3/0/8/130874075/918d1f224d80353.pdf
    • http://runifika.prohuman.co/uploads/1/3/2/7/132740373/telesunopeduw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1373/files/98826474730.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3034/files/adobe_acrobat_dc_pro_edit.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/janama.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/45186377166.pdf
    • https://cdn.shopify.com/s/files/1/0430/9090/3193/files/bisizedusuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3300/1126/files/gb_to_terabyte.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0343/files/417579257.pdf
    • https://cdn.shopify.com/s/files/1/0437/8840/2839/files/hiv_aids_basic_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/3607/3366/files/73807940437.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/26828334918.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/vefelutazopobufidepe.pdf
    • https://cdn.shopify.com/s/files/1/0446/2454/3907/files/lil_weebie_savage_life.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005327.bin
015e39355fdd79e2424668693d3ca0a4db2190336edbbdd804ec49389dc6121e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5327 5296 bytes
font_01_sfnt_off00006520.bin
4336bede079c25e4124386f69745b70df46feb62534d29e76837194222b5a513		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6520 14668 bytes
font_02_sfnt_off000092e5.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E5 16204 bytes

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