Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5bc9e97cad8907…

MALICIOUS

PDF

51.8 KB Created: 2020-09-06 10:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0b3764492412f49af3f80302f020dbc SHA-1: 2bc2266e68b6c85875ecdc39e5e2724a091244b1 SHA-256: fa5bc9e97cad89075725b932f0c3b17b49200d6e9a74df29b7db421f761b28e1
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, 'https://ttraff.link/wix?keyword=blog+templates+html', which is designed to lead users to further malicious content. The document also exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on platforms like Shopify, suggesting an attempt to manipulate search engine results or distribute further payloads. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=blog+templates+html
    • https://cdn.shopify.com/s/files/1/0430/0845/8905/files/tokugewo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/tuwunejagot.pdf
    • https://cdn.shopify.com/s/files/1/0436/5457/8334/files/tuzusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/kuxorepelitagusitumajop.pdf
    • https://cdn.shopify.com/s/files/1/0434/0849/0663/files/dokaximi.pdf
    • https://static.usrfiles.com/ugd/20d83a_3671a77119ce4da88817c415b6cdd3c4.pdf
    • https://static.usrfiles.com/ugd/e4d7df_beccbf278bc147ed82e15b10e049f206.pdf
    • https://static.usrfiles.com/ugd/10b11f_3a0e76f43d78457789b5c689ed7bf332.pdf
    • https://static.usrfiles.com/ugd/6846fe_05f4f79af1524e38964b2fbfb8882f8e.pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/30488062390.pdf
    • https://cdn.shopify.com/s/files/1/0441/1808/1688/files/novirisuredetoganej.pdf
    • https://static.usrfiles.com/ugd/1decf9_c11621a24456481fabcc19c7a0615f57.pdf
    • https://static.usrfiles.com/ugd/4aae87_8598cb92e4584147af8d96d239ed945d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081ca.bin
37059b65ba069819355d176b8644495720df6a3d5aff1630ef3188a1d2d113d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x81CA 4820 bytes
font_01_sfnt_off00009237.bin
1861325d77ddb3e9a65d1a11ca62036789405bd73a1ea2031f4c8ea7686c81a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9237 10080 bytes
font_02_sfnt_off0000b4a6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A6 4324 bytes