Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78e362f1e960bb9…

MALICIOUS

PDF

39.1 KB Created: 2020-09-01 21:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28f02b0f6dfb04e21700255120d25e72 SHA-1: 3eb5d0ba1594d5cfa3a93f50f2c477e78c85f5d9 SHA-256: c78e362f1e960bb967678bc37a1ec592cd43f0f9267265931b7b3d5ad3c789ae
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.ru/wix?keyword=norton+primary+school+malton+ofsted+report'. The document body, though heavily obfuscated, appears to reference the same report title, suggesting a lure. The presence of numerous links to static.usrfiles.com, while individually benign, contributes to a link farm heuristic, indicating a potential SEO poisoning or redirection strategy. No scripts were extracted, limiting the analysis of direct payload execution.

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.ru/wix?keyword=norton+primary+school+malton+ofsted+report
    • https://static.usrfiles.com/ugd/2f3ac6_21b4a68c71ac46d3a60b64da8346995d.pdf
    • https://static.usrfiles.com/ugd/f515ca_5a43795607a44916959a37885b57ceec.pdf
    • https://static.usrfiles.com/ugd/90423f_40458bb4d5794a0abcfe62c9e20b7aaa.pdf
    • https://static.usrfiles.com/ugd/33a2e4_3e620e82ebcf4e0480bac2e4c23ac7c1.pdf
    • https://static.usrfiles.com/ugd/affb4a_4b237987eebc446da57eb2d2338a6435.pdf
    • https://static.usrfiles.com/ugd/1a89c8_02670dff397c4e2e9b621d3e6d9e695b.pdf
    • https://static.usrfiles.com/ugd/271e65_69a331a5fc724f25a143c8b1155703af.pdf
    • https://static.usrfiles.com/ugd/43d598_01223cf10a314571a1ade38c50f0170c.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/marorelufafivami.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/21740944775.pdf
    • https://cdn.shopify.com/s/files/1/0430/5394/0887/files/55408141688.pdf
    • https://cdn.shopify.com/s/files/1/0433/5265/3973/files/serexorimenusedavaripojem.pdf
    • https://static.usrfiles.com/ugd/e643da_99dd89b59d9c471aada79024e58d2742.pdf
    • https://static.usrfiles.com/ugd/d1c05f_4b934326d7704e789deb44fc90b1de67.pdf
    • https://static.usrfiles.com/ugd/b8c837_f67081027b4440a8ab4eb0bf93188dc3.pdf
    • https://static.usrfiles.com/ugd/b8c837_286d42d3721b4a818ad156a9620b876c.pdf
    • https://static.usrfiles.com/ugd/affaa6_26685e5a6ca042b084334baee759e995.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_off000059e0.bin
7ac0e0f2ba898a22031a636005b206a263e73026064c5adf68be22057a759b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E0 5464 bytes
font_01_sfnt_off00006c58.bin
aacccd752339f5a3d469dc4da499c0833650a0c9510067e0e565c446b217cb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 10396 bytes

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