Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35fd1219e0dd616…

MALICIOUS

PDF

46.0 KB Created: 2020-10-27 18:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb7e53cb7649356face7a85fc6ed812 SHA-1: bc1714ffb572f358f75c1affffaf7dd1eba5b015 SHA-256: d35fd1219e0dd6167bced89723e3a3b50b1829b8f68f0cc121a931ef0a04921f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a link farm designed to direct users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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://cctraff.ru/strik?keyword=mechanicsburg+middle+school+staff
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f8f2f342a8fa.pdf
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5f9666d036d96.pdf
    • https://cdn-cms.f-static.net/uploads/4381534/normal_5f8b21ae1433c.pdf
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f90e3511298d.pdf
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/49c8f69b631a820.pdf
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/e0314.pdf
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/649272.pdf
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/nafikekopajime.pdf
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5f96c8c645533.pdf
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5f9654398c9df.pdf
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f87417e3a9fe.pdf
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f8acba396bfb.pdf
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5f972f3999a88.pdf
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5f90500d17e94.pdf
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5f92549721333.pdf
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f8f672f3753a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pazifetanegapu/vipoworido.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/mexobexejusede.pdf
    • https://cdn.shopify.com/s/files/1/0484/1924/2152/files/google_map_offline_download_android.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006808.bin
9c3ac5ba4687b39cf9243e44aeec808e8eb4433eb4982afd81b85efdc0023274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6808 5464 bytes
font_01_sfnt_off00007a5f.bin
a86cb553b90e12a16f44cb916945ecdfc50cdc2d7263d888c2130c7f89c8e1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 9988 bytes
font_02_sfnt_off00009c93.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C93 4324 bytes

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