Malicious PDF — malware analysis report

Static analysis result for SHA-256 716dae183cc6e1e9…

MALICIOUS

PDF

34.8 KB Created: 2020-08-08 06:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bac8bf6e035a10e2f1ca7cc155b9533a SHA-1: 9d906214c113f3f476279570b75ac24e52aa75fd SHA-256: 716dae183cc6e1e9fadddf0ec98f20d93297010f5fc952be4eb685c25c298635
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'bible study outlines pdf' and the malicious URL, suggesting a lure for SEO spam or phishing. The presence of embedded links and the ML classifier's high confidence score indicate 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.com/pify?keyword=1000+bible+study+outlines+pdf
    • http://files.northyorkcpr.com/uploads/1/3/0/8/130813447/2f09c0.pdf
    • http://pufukab.family-martialarts.net/uploads/1/3/1/0/131069934/tifumilularegeme.pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • http://files.stmarywinnipeg.org/uploads/1/3/0/9/130969681/6e827a.pdf
    • http://javubiso.shamansspirit.net/uploads/1/3/1/4/131407406/dimos_poloxiboki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/1976_cutlass_supreme.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/53981972746.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/resume_format_for_job_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2703/6322/files/python_count_function.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/stoner_john_williams.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/64594753861.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/vusoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/wupogofemamevimeve.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/20584009699.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/76440779961.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/55892875533.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7333/files/kejipeledojo.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_off00004a48.bin
aec2740a1cde3aafd72b3ebfc2a94c668f818f21267e60ad80520ca3043a117b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A48 5072 bytes
font_01_sfnt_off00005ba4.bin
75f1b1c6bd53f9a04cdc7bbe2f878a057d53455571a9733c0c80d17321c57d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA4 10140 bytes

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