Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb4735101a54c09…

MALICIOUS

PDF

57.3 KB Created: 2020-08-30 07:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9f80658177769c2026ad5d1328f2961 SHA-1: c62143f70791fe2cdd8a55c091a5a78f495008ea SHA-256: ffb4735101a54c09c85e3ac2e8a7d1fa87425c6c65f4032c97717c52bfaa0d19
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector. The document body, though partially corrupted, contains text related to 'Financial analyst interview question' and a URL that appears to be a lure. The presence of numerous PDF links, many pointing to Shopify domains, suggests a link farm used for SEO poisoning or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=financial+analyst+interview+question
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/65992777314.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/sinezonubifilesamud.pdf
    • https://cdn.shopify.com/s/files/1/0441/4413/2248/files/10148094256.pdf
    • https://cdn.shopify.com/s/files/1/0460/8399/7860/files/23452808142.pdf
    • https://cdn.shopify.com/s/files/1/0457/4448/8604/files/xadezakafukun.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/32724364687.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0439/5712/5278/files/amperimetro_de_gancho.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/laporan_pendahuluan_bblr_nanda_nic_noc.pdf
    • https://cdn.shopify.com/s/files/1/0437/2496/3990/files/advantages_and_disadvantages_of_television_advertising.pdf
    • https://static.usrfiles.com/ugd/93c935_96135fb8ada5447fb52a9090ca563d45.pdf
    • https://static.usrfiles.com/ugd/36f25b_90c79f68b15e4ff79ebd73e332d2d26e.pdf
    • https://static.usrfiles.com/ugd/9dda13_663431300e4f499a87bbdfa810027c63.pdf
    • https://static.usrfiles.com/ugd/eb4c03_9efeeaabd5d245fb8fc4cbd57e93c7aa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a35.bin
a7454dc8e4963b295b8d4929000ba2e3de2f4ffc62498ecdb84e2fa2dd85400b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A35 5128 bytes
font_01_sfnt_off0000abcb.bin
bcb912701e36abd753a10362ff5106f068f11bd3c236b40666b41be7347729b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xABCB 13908 bytes