Malicious PDF — malware analysis report

Static analysis result for SHA-256 2987414edb8e3fcb…

MALICIOUS

PDF

36.1 KB Created: 2020-08-01 20:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 125c2359923e9f9f26fb136f816c3313 SHA-1: 16e3920bff0a6ee1ff8f16c7dfe1009ec83d869e SHA-256: 2987414edb8e3fcb907a73f62a716b14cd0ae7ed9a26ef06cb3b8aead77e6776
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. The primary attack pattern involves luring users to external sites via these links.

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=die+young+sylvan+esso+lyrics
    • http://files.irishwolfhoundsvictoria.com/uploads/1/3/1/3/131381204/lasebu.pdf
    • http://files.catholicadvisors.org/uploads/1/3/0/7/130739646/wifobedutuj.pdf
    • http://files.quailbellmagazine.com/uploads/1/3/1/3/131398133/2995762.pdf
    • http://files.tukatavientiane.org/uploads/1/3/1/4/131409794/dizisamibatodu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/matteson_il_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/xozivug.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/tabuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/gexozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1827/files/bijagaruxadelelajux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/16935952428.pdf
    • https://cdn.shopify.com/s/files/1/0437/7244/4823/files/58675917476.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/gamefajanofosimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.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_off000052ab.bin
40628b9da51f76c7e3653adb24c506ec011b06746562f9eff3c5eb54f0858c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52AB 5128 bytes
font_01_sfnt_off00006449.bin
c27c7b8eb3ae8a9c8beb34a310ac81b004eb8a4d6ced89eaa672a1a2846cbf52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6449 9196 bytes

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