Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b9426cada02886…

MALICIOUS

PDF

50.0 KB Created: 2020-08-09 05:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bff043e5c7f1f30dabba5f3eefe0d9fb SHA-1: 764c75595bf8f2dc331dd416be6ab22ac4bfb74e SHA-256: 18b9426cada028860d9a33888460cd158529d8b03530bff4e379166d5a646e4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of a known malicious redirector URL reinforces this assessment. The document body, though heavily obfuscated, contains references to book titles and URLs, suggesting a lure to external 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.ru/pify?keyword=agatha+christie+mrs+mcginty+est+morte+pdf
    • http://files.bobabobateabar.com/uploads/1/3/0/7/130775393/mewejikidekikek-pizoko-wesinexezutuwof.pdf
    • http://rozojitef.ryannrase.com/uploads/1/3/0/7/130739024/2bd2e74779970ea.pdf
    • http://files.xinwenengineering.com/uploads/1/3/2/7/132711999/mesenuwopufulun.pdf
    • http://files.perhamxc.com/uploads/1/3/1/4/131453682/7044096.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/40302214140.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/86749918522.pdf
    • https://cdn.shopify.com/s/files/1/0448/6601/1298/files/ethnography_research_design.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/beyond_compare_keygen.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/zewarotevupiwesamope.pdf
    • https://cdn.shopify.com/s/files/1/0438/8985/2568/files/fonubuwalizolir.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/lixisi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0147/8307/files/mergers_and_acquisition.pdf
    • https://cdn.shopify.com/s/files/1/0451/3228/4057/files/methods_of_teaching_business_subjects.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/72163194555.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/acids_bases_and_salts_class_7_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3362/files/shiva_tandava_stotram.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/75778060596.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007783.bin
d4c2cfed4c75bd31128ff1c42d2733d9eb190bfb0ee0415e6c17a2694d24c502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7783 5416 bytes
font_01_sfnt_off000089d4.bin
8723ade8342b27520e8b62d7ea9cf02555f2dd0815aee81eafee3895ef988046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89D4 10040 bytes
font_02_sfnt_off0000ac26.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC26 4324 bytes

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