Malicious PDF — malware analysis report

Static analysis result for SHA-256 66003cd88d4a8273…

MALICIOUS

PDF

49.0 KB Created: 2020-08-24 17:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28ed303e94802a601d3b71a2517664bd SHA-1: b43848c19104dcb83b774b6e881c92619e8f7d42 SHA-256: 66003cd88d4a8273df380468eab02474bda86b8523d48c330434780d29d5f957
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, appears to contain the same redirector URL and numerous other URLs, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be a precursor to delivering a password-protected payload, further increasing the likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=aprendizajes+clave+sexto+grado+primaria+pdf
    • http://files.morganephotos.com/uploads/1/3/2/6/132681887/dc8ca12901.pdf
    • http://files.newbeginningsintuitive.com/uploads/1/3/1/6/131637114/5780893.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/22475635768.pdf
    • https://cdn.shopify.com/s/files/1/0433/8244/0103/files/25311389110.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0433/9004/2268/files/46936307854.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/very_hungry_caterpillar_printable_coloring_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/58065362891.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/manufacturing_systems_engineering_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/52080455819.pdf
    • https://cdn.shopify.com/s/files/1/0428/7083/3319/files/piwunekixonarilasofem.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2694/files/46704817457.pdf
    • https://cdn.shopify.com/s/files/1/0430/3434/5625/files/marketing_concept_example.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/resignation_letters_for_nurses.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/aikido_the_complete_basic_techniques_gozo_shioda.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060c7.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C7 6744 bytes
font_01_sfnt_off000071ae.bin
7d760910bf8f36ba7ad9ec5ba477363139877a8ac856870c296edf435a056729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AE 5720 bytes
font_02_sfnt_off00008515.bin
2b17894289ef4ac549ca5ccbfe538e6ebde94701791c0542cba9a71f2d67f349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8515 2268 bytes
font_03_sfnt_off00008f28.bin
5fd2441b15c3f0f75b0797f4eb5f38665bea6705f7406a9f7115d62d79b7c5a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F28 11500 bytes

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