Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8979bd833defc15…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 03:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbcbe81ddd857b3135d25664b15e1fd5 SHA-1: 0279f7dcd407849b7f0df70e776f2267b151630f SHA-256: e8979bd833defc15a438c08f5e0ed84abbbdfa1bbe4d3512c9be099581cc00c6
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/wix?keyword=castrol+syntorq+lt, points to known malicious redirector infrastructure. The presence of this redirector suggests the document is intended to lure users to malicious sites, likely for phishing or to download further malware. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=castrol+syntorq+lt
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/uark_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/84347173976.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/zamosaruriwom.pdf
    • https://cdn.shopify.com/s/files/1/0440/6067/2165/files/1001231694.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/35804598330.pdf
    • https://static.usrfiles.com/ugd/3b0c81_82205c7e741941ebb3074bb0826c80f3.pdf
    • https://cdn.shopify.com/s/files/1/0462/4374/1845/files/86553546250.pdf
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/the_lion_sleeps_tonight_notes.pdf
    • https://static.usrfiles.com/ugd/909b15_766480bd54ab435188c4a74603ac6b19.pdf
    • https://static.usrfiles.com/ugd/b8c837_63e69173a194444a94af18c03d77571b.pdf
    • https://static.usrfiles.com/ugd/4b7290_c6c365d622aa4bddabdae1867014319e.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_off00006dff.bin
afd09b886eece14fd9e7d3a34fee6daf0f4d60a0ae414acfd42456aa9085a085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFF 4812 bytes
font_01_sfnt_off00007e6f.bin
b57fb5a3ac347481063ed1d1f316fb1b94bdcb3fc5664993309c2938fce89450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6F 10500 bytes

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