Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ffc37e5477b55c…

MALICIOUS

PDF

42.3 KB Created: 2020-08-11 05:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4986c5258d15328d9c803c73511377f SHA-1: 30ff93e3b897a845752e446295405b72c61f4f93 SHA-256: 27ffc37e5477b55cc516ccd91188b0627904f3a4e8ba50abb9f73f7482436acd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=assets+and+liabilities+of+banks+pdf, which is likely used to funnel victims to further malicious content. The document body itself is largely obfuscated binary data, but the presence of the URL within it confirms its role in the attack. The ML classifier also strongly indicated maliciousness.

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=assets+and+liabilities+of+banks+pdf
    • http://beredibo.apexengineered.com/uploads/1/3/2/7/132740214/c23e25.pdf
    • http://files.thompsonsphotos.org/uploads/1/3/1/4/131407274/gifebija_tolubef_tatesasano_lanazakugu.pdf
    • http://files.quietlyjudging.com/uploads/1/3/0/8/130813094/1527474.pdf
    • http://xotamif.sarahtorti.com/uploads/1/3/0/7/130775557/1406d832d5a.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/87134682411.pdf
    • https://cdn.shopify.com/s/files/1/0437/3879/2085/files/finolilog.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4081/files/lesubagiwupetoduwubez.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/41114820537.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/62339916897.pdf
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/luzuduvokoxoxexujujeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82973104521.pdf
    • https://cdn.shopify.com/s/files/1/0433/5625/8454/files/bookmark_in_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/matrix_multiplication_optimization.pdf
    • https://cdn.shopify.com/s/files/1/0431/3055/2474/files/giddens_runaway_world.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/33679277649.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/college_of_swords_5e.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/biblia_dios_habla_hoy_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/pr_contracts_template.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_off0000674f.bin
9e285e9b9a70a00c6a025c971617d3aaeeb99a0d69aec4e77797449215668009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674F 5132 bytes
font_01_sfnt_off000078d1.bin
67f935330c93c170df35d12950776cafefb3fd75db794f7cd9b169af61ee789a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D1 10468 bytes

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