Malicious PDF — malware analysis report

Static analysis result for SHA-256 2443c92a31949d40…

MALICIOUS

PDF

45.7 KB Created: 2020-08-29 21:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3389f939ddb4cc27c17a5fbec424a33b SHA-1: efd116cbb94a17b6474b57ea79ba575ac97af971 SHA-256: 2443c92a31949d404ac8131f209a3ef807ad5cd3af440d56b9b944e961c831f9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a domain known for malicious redirectors. The primary malicious URL is `https://ttraff.com/wix?keyword=completar+palabras+para+ni%25C3%25B1os+de+primer+grado`. The document body, though partially garbled, suggests a lure related to 'completing words for first-grade children'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.com/wix?keyword=completar+palabras+para+ni%25C3%25B1os+de+primer+grado
    • https://static.usrfiles.com/ugd/eb4c03_1f70f973cd2f499aba8932d279527c8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_de375d03be5b4531aae2a3e01fc7263c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5525ed7b916441298663e2afd7080dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1351572647e1432a8131b2b08e7c330b.pdf
    • https://static.usrfiles.com/ugd/b4609a_8f9c4b25030e49b286fc63343275f69d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e41bf04d25d40b1af3d2ff4f7f16f33.pdf
    • https://static.usrfiles.com/ugd/b8c837_440639ac48aa415889b8eed6d5e7fc38.pdf
    • https://cdn.shopify.com/s/files/1/0434/4401/1168/files/mefunerubatudevepexo.pdf
    • https://cdn.shopify.com/s/files/1/0462/7346/2434/files/closing_balance_sheet_example.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/form_apply_visa_japan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/fomogezolategisuluxezafef.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9e2b75fe5cf49abb033ac07ce16b3c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3516c67845fd40e2adecda447aa46ce6.pdf
    • https://static.usrfiles.com/ugd/b8c837_86b54a4779884ccc938a13b2a93799e8.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_off00005a44.bin
d4f31496349407b596700c0eac533f6d33087b568b62de83554d3f7fa3929663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A44 5536 bytes
font_01_sfnt_off00006ca7.bin
a70d0530cc798f3c93050d8f5b4b4c44ab4809fb498f0a336dba39a99b71f539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA7 11332 bytes
font_02_sfnt_off00009206.bin
b68b0740fa03982756c50cf71ba91bd1c73418125a29db080538f24aebd90fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9206 16164 bytes

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