Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa677e2dc35ce21…

MALICIOUS

PDF

32.7 KB Created: 2020-09-03 08:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f71a1949677bb2f7fb2f39222c1d3037 SHA-1: d85666e7dbe2e8c84168fab7b5695f92a240f7a0 SHA-256: 3fa677e2dc35ce21fa628bdaecd0fc4f7cc525ca4ae88b79815530d15162fce9
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised as a search result for "peter cetera songs free". The document body, though heavily obfuscated, contains the same search query and a URL pointing to the redirector. The presence of numerous other links to static.usrfiles.com, while marked as benign, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=peter+cetera+songs+free
    • https://static.usrfiles.com/ugd/2b3f46_0251a25626df474da59233d7f4fc4235.pdf
    • https://static.usrfiles.com/ugd/b0cb2d_434883e9ed7e47ab85d5147e116f3aac.pdf
    • https://static.usrfiles.com/ugd/e643da_0795a5828a164b8298b2b722c90bd8e4.pdf
    • https://cdn.shopify.com/s/files/1/0454/6674/7030/files/advertising_campaigns_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/agile_development_methodology.pdf
    • https://static.usrfiles.com/ugd/b8c837_85196644eabb4488bdd8950c3fdd374f.pdf
    • https://static.usrfiles.com/ugd/07e02c_3d61a6ed75e24152ba33c8a0c5332bdc.pdf
    • https://static.usrfiles.com/ugd/2ca09c_e4cc351033274430bafd898b9a4b98b8.pdf
    • https://static.usrfiles.com/ugd/cece23_1a44950f97f24d62be6daf6e16fed3aa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9127/8486/files/54179000357.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/tatelezugetiduxutu.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_off00004298.bin
917ef29a8120ae1a3f1e60277be1980f12de5c2dad1e159e0fcd3ceb5eee9581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4298 5020 bytes
font_01_sfnt_off000053be.bin
e352a0872b8857368d0f38b406e9ffc5be3ae9769d635c452bb5e6c52f8ca94c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53BE 10204 bytes

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