Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c167ce921e80a5b…

MALICIOUS

PDF

41.6 KB Created: 2020-08-20 20:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f55b941ca95db4c018527854d20f7e1 SHA-1: ad77b0369ac016e1c8ec0d29ec0d87c9f61812dc SHA-256: 5c167ce921e80a5b22d86de8e4ec1722582fa76f66b3a1faf42869c206ff9b87
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to what appears to be link farm infrastructure, including a critical redirector link to ttraff.com. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to disguise malicious activity under the guise of educational worksheets. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially 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/pify?keyword=simplifying+exponential+expressions+worksheets
    • http://files.govindaincense.com/uploads/1/3/1/3/131379117/fokalazepedibes_giposad_zorugejav.pdf
    • http://jepode.klassybks.com/uploads/1/3/2/6/132681590/nuxazalejebof-nazetonex-mesibabaguz-gorisefiparafof.pdf
    • http://files.twocann.co.uk/uploads/1/3/1/0/131070367/229c43d25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7213/4049/files/wonazog.pdf
    • https://cdn.shopify.com/s/files/1/0439/2206/3515/files/44500298567.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6408/files/pathfinder_advanced_race_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35679391278.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0572/files/adverbs_of_sequence_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/xazalam.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/segexoladegesowibetigis.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/38880875325.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/kexaleribefoxusoxum.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/85643774167.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/encyclopedie_berbere.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/43204373257.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_off00006419.bin
3216672600cace4e73398e62e5da799be00670cdbc9d669988cf94a586553e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6419 5744 bytes
font_01_sfnt_off00007798.bin
4ff28f77ea9b7a7d69d703bac76b88159abb63363c6227f33ad4ec64bb58d435		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7798 9764 bytes

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