Malicious PDF — malware analysis report

Static analysis result for SHA-256 e439e4281320601f…

MALICIOUS

PDF

47.3 KB Created: 2020-09-09 08:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fd0248664b13f32d687f8324074acef SHA-1: cddb8d2ed20e2c3277852d55d7ddb2f299402e38 SHA-256: e439e4281320601f49744b7bae2488c4e9b080c941586bc75ea50fa2d66d9def
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, with at least one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to lure users to malicious sites. The primary attack pattern involves redirecting users through a chain of links, likely to a phishing or malware distribution page.

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.me/wix?keyword=arch+linux+raspberry+pi+2
    • https://cdn.shopify.com/s/files/1/0437/7467/3057/files/22461110321.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/xopejavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/20513920563.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/59943877680.pdf
    • https://static.usrfiles.com/ugd/c1108c_afc22d13b3874f8a96373fba7ab533c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fd7f8ff25d8455e83d95834c6718109.pdf
    • https://static.usrfiles.com/ugd/1c90dc_1e9fa43b38a74868b044ed63df6d42dc.pdf
    • https://static.usrfiles.com/ugd/cc03df_34a65f656da34bcc94fc261eedcefaa3.pdf
    • https://static.usrfiles.com/ugd/594ae5_d4c2e97c3e3d46dca2c70ed438f6282e.pdf
    • https://static.usrfiles.com/ugd/ab922d_713787f0935b4ec39b426477942a6684.pdf
    • https://static.usrfiles.com/ugd/d162e3_48c6e09781a544c5b6986007e9fbaaa8.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_off00007912.bin
2030bee8cc69ea3a7a9dab0bf4bdb039bfa072cc42ae8aefa9c582b035cf33d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7912 5452 bytes
font_01_sfnt_off00008b9d.bin
945216f3b599d4f45ffba0f83e6706c4ae0795acbbeaf3c7d9c12b4a29b6e04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9D 10832 bytes

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