Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb771368ac614164…

MALICIOUS

PDF

38.0 KB Created: 2020-08-08 01:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e60d59bcee62bcfa862893fb9cbcfe SHA-1: b1d4303242edadf893dd646477a180f3e8adc032 SHA-256: cb771368ac61416489440a0d324d527f1f9d69df3dab1a343e2ce7c6ad17e428
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a large external PDF link farm, suggesting a potential SEO manipulation or content distribution scheme. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector point towards a delivery mechanism for further malicious 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=masterpieces+library+architecture+design+pdf
    • http://files.colourismyworld.com/uploads/1/3/2/3/132302749/xotedo.pdf
    • http://files.freedomcommunity.org/uploads/1/3/1/0/131070846/rogebateketufel.pdf
    • http://mometu.bagsofnaturestore.com/uploads/1/3/1/4/131453060/wefanotigowix.pdf
    • http://files.storywings.net/uploads/1/3/0/7/130775403/xumoboxof-jasasavowogarag-lamizexo-wuwaxoromit.pdf
    • http://files.rearchitect-ma.com/uploads/1/3/0/8/130874330/528849.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/bezejizigijijij.pdf
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/lelojatisoxusifibig.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/14932937193.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/56332428443.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/movoruximidido.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49090326843.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9807/files/tufoverajamawibefito.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/xazoki.pdf
    • https://cdn.shopify.com/s/files/1/0444/6345/6423/files/administrasi_tes_ist.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/politik_pluralisme_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0438/9342/4283/files/munonoximifura.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/70545482913.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/calendario_de_octubre_2020.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_off000054c6.bin
9921c988ec80c47954ce1df1e35ab3eee73b9b115d5264997ed77d558ee23010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C6 5664 bytes
font_01_sfnt_off00006819.bin
3e1b2835b7634d698df585a23bfcd234087f89f4215ac22a22bc0d27b4d6ac21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6819 10060 bytes

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