Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cd3434c2b21638…

MALICIOUS

PDF

43.3 KB Created: 2020-08-06 18:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fbf252c8638259ca069fa29cdb0d5e7 SHA-1: 296fcfb271f5162e2a972a7c96659de0ba769a0b SHA-256: e5cd3434c2b2163841406286a41a9bc0883aea59aa0038ec09d2f3a5904179fa
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=angina+de+vincent+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0435/2809/3856/files/relumo.pdf'. The ML classifier also strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains the malicious URL, reinforcing the lure.

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=angina+de+vincent+pdf
    • http://files.pacsc.com/uploads/1/3/2/3/132303118/5433832.pdf
    • http://files.marinersguide.info/uploads/1/3/0/7/130775959/178d2ae253d9.pdf
    • http://files.tangonegrofilm.com/uploads/1/3/0/7/130738875/rolubotax-ratatedur-jebiberolusov.pdf
    • http://files.tangonegrofilm.com/uploads/1/3/0/7/130738875
    • https://cdn.shopify.com/s/files/1/0435/2809/3856/files/relumo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5627/3310/files/body_mass_index_chart_in_kg_and_feet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/rojudigetivuvironitanoli.pdf
    • https://cdn.shopify.com/s/files/1/0436/3668/7008/files/fibonacci_sequence_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/2648/0295/files/vixenewutagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/siditinonivi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/ruwered.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/71620489629.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/4016622476.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/tekadoguwuvasatej.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/54412425909.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/rivixulu.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_off00006b79.bin
8978474d30ba65cd266aea9cd2115bd31405456218c06a0155ec5e7275452f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B79 5064 bytes
font_01_sfnt_off00007cdd.bin
5cee722de26b89ca6413e04ea746b01695a53cb7914c3fb0329ce32a0554bd7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDD 10340 bytes

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