Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee304543e560bb48…

MALICIOUS

PDF

38.2 KB Created: 2020-08-10 19:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda728164b82159b0d54d1ee1bbc51ce SHA-1: 419fbc01046bbab85312dbf895cd8e80fa376b16 SHA-256: ee304543e560bb4860e5f7800557b872e18bebbbeeb30f5094a9cf377ada6bc9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves leveraging these links for redirection, likely to a phishing or malware distribution site.

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/pify?keyword=vowels+and+consonants+ladefoged+pdf
    • http://files.tourofguam.com/uploads/1/3/1/4/131437311/442670.pdf
    • http://negem.richardsonlegalpllc.com/uploads/1/3/2/7/132710621/rekaji.pdf
    • http://files.ibstudyskills.com/uploads/1/3/1/4/131482915/dolorobiwiwinas-nexadimefe-mewuxibubizad-kibikiv.pdf
    • http://files.philipcleaning.com/uploads/1/3/2/6/132680967/viwojeve.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9122/files/7265501517.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/auditor_s_liabilities.pdf
    • https://cdn.shopify.com/s/files/1/0437/9980/6113/files/banquet_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/8518/5702/files/xotelilofegazutigaramijaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0770/files/utilitarianism_ethics_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5609/files/gokuteloj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/legifig.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4313/files/milelosedagokafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/pasonokubezaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/neoclassical_literature_authors.pdf
    • https://cdn.shopify.com/s/files/1/0434/7713/9613/files/english_course_for_spanish_speakers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/keboduxuvotagatu.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_off0000566f.bin
9352ae06cd817b4385eb5467cd63c6576f4c726562f13f5051b3b64159b56ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566F 5284 bytes
font_01_sfnt_off00006892.bin
ff43c9ca6153de33e52e7f2b616100ece4ce7c0e74f5551d566433a61aaa8257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6892 10164 bytes

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