Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c5a6f8ba9efa1b…

MALICIOUS

PDF

47.6 KB Created: 2020-09-02 05:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 557f548348627055180f430126e4b8bd SHA-1: 7a0213d2e62b150cc9d6ff1a2440181899ebd424 SHA-256: 77c5a6f8ba9efa1bdd678a2b249ab6591ae07b65ec3568b1f3b8c13cd37ff4c1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous links and the ML classifier output strongly suggest malicious intent.

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.cc/wix?keyword=manualidades+de+fieltro+navidad+2017
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_4226bc9fb25844a5a898b5329b05a88e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8195b199f5f944f8bde9ad8f53cfa088.pdf
    • https://static.usrfiles.com/ugd/b8c837_53b723ca448249d7b193bc810be51e90.pdf
    • https://static.usrfiles.com/ugd/97368a_b1f9a06af2d44135bc76d7b6aaf30297.pdf
    • https://static.usrfiles.com/ugd/217b8a_8080ea38537f4129bfda086e980f2373.pdf
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/74075197738.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/iupac_nomenclature_practice_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3118/3016/files/mapa_metro_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/unaltered_augsburg_confession.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/40263920142.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/82799494030.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/conceptos_basicos_de_epidemiologia_veterinaria.pdf
    • https://cdn.shopify.com/s/files/1/0439/1288/8488/files/tibalug.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4741/files/79651329976.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/33993579737.pdf
    • https://cdn.shopify.com/s/files/1/0437/8594/5246/files/14049965725.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b50.bin
3d2b944fc8cd753456c398d38b9264ccd5de7b02814f3de16a7f10494d7c92e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B50 5372 bytes
font_01_sfnt_off00008dc2.bin
2ca9ee2fc25275be635d8902f933388491c17f8e73d26d1efc9de4c8b8db5122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC2 10892 bytes

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