Malicious PDF — malware analysis report

Static analysis result for SHA-256 61940d6a017d4028…

MALICIOUS

PDF

70.9 KB Created: 2020-07-30 18:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 227fbf942e025a5b6499439318533899 SHA-1: 1a80ee2b375731fd866dc7c3d25cd555623f7b40 SHA-256: 61940d6a017d4028785f01a379d6db7eb66c784b613f84e035b04c4e55673df0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, suggests a lure related to 'El materialismo histórico pdf'. The presence of embedded URLs and the link farm heuristic strongly suggest an attempt to direct users to malicious sites, likely for phishing or malware distribution.

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=el+materialismo+hist%25C3%25B3rico+pdf
    • http://files.gilberthighchoir.com/uploads/1/3/0/7/130776089/zodazoluxumifu_waxeroxib_totep_rifusomoxakek.pdf
    • http://files.edinburghcorporate7s.com/uploads/1/3/2/7/132741397/7d02e.pdf
    • http://files.infinitefitness.studio/uploads/1/3/1/3/131383318/6a238aca42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5703/4902/files/8736119040.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/pasukofenadijigiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/parekil.pdf
    • https://cdn.shopify.com/s/files/1/0438/2880/5789/files/82785011669.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/faxotugazoparakilopilame.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/81533507851.pdf
    • https://cdn.shopify.com/s/files/1/0429/1962/4870/files/vezan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/demojobibosofebibaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/94373274361.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/66140209695.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/62014705188.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/58012258127.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/rozubenejomovilati.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_off0000d603.bin
bc661c376ee7521738e7309b44d91268c99eca20b4964a8a570606d4e48d7e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 5172 bytes
font_01_sfnt_off0000e752.bin
aafec2b6db84cb0f5e21777ac28b8ec4322c01f7705571a97f93b65ccf13d7ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 11316 bytes

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