Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fadd7db49526069…

MALICIOUS

PDF

43.0 KB Created: 2020-09-19 12:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fc19266e312d11eb83796e74188c132 SHA-1: 8393bee6bceb754830111132761ad7695aa879d1 SHA-256: 2fadd7db49526069e51b15b4bdf2f8a46ff1e70cbf8f822435c8235f6cb6f393
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of the malicious URL and the link farm suggests an attempt to lure users to malicious sites or manipulate search results.

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=conjunctions+list+pdf
    • https://cdn.shopify.com/s/files/1/0428/9826/0124/files/corroseal_rust_converter_home_depot.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4717/files/4709536885.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wemulaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/17351044591.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/65756358234.pdf
    • https://e93beb5e-46ed-4091-a7c6-223cfdd67a8a.filesusr.com/ugd/d90490_72a92638ff3547789839f80a66c1cf67.pdf?index=true
    • https://73a19ff0-dde6-41df-9526-80e64e2da246.filesusr.com/ugd/24deb6_0b0362750e6b49a99f474ef6f9463ad3.pdf?index=true
    • https://ec3ee9cb-336b-4816-9ec8-6d64d8c3a8ab.filesusr.com/ugd/0251f0_2c7027fc38d9429d984e213af26d177c.pdf?index=true
    • https://1e548ce8-1db9-4ad7-b4dd-57934eae47c4.filesusr.com/ugd/ea78e0_114b45e3b210406a891ed9db9c765308.pdf?index=true
    • https://ac28b337-1f59-4db3-b906-b8fe9b36dfcc.filesusr.com/ugd/4826f5_b15f9ca2855c4acbbd1d9d56967a19f5.pdf?index=true
    • https://3ef097e0-d8ef-41c9-81e0-2a29e62dba9e.filesusr.com/ugd/45fd81_e7aaf39a271c46048533d15ec424b808.pdf?index=true
    • https://d48b5de3-119b-4377-b1ce-390cd6bbd0e1.filesusr.com/ugd/a107db_c03168717b894c01a9ecdc9a2c00cf8b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0477/9963/2039/files/11194787788.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/89954384370.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_off00006bf8.bin
370e93176f4bafb8edf18416f0fb7bbe4539564c6d1f9e73837738720ecd4e0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF8 4824 bytes
font_01_sfnt_off00007c7d.bin
5c4bed7832d4abfcd680dca2be4d0c22fb1a7061ce873e02bb347de737d4f3c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7D 10392 bytes