Malicious PDF — malware analysis report

Static analysis result for SHA-256 7420346810566279…

MALICIOUS

PDF

79.9 KB Created: 2020-08-06 02:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f9bcf8aa7f8502912cef5cadec2c24 SHA-1: 05f661581fa775439385b9fdf329f124eef45379 SHA-256: 74203468105662791d313b5b270d9b8a473284615b2e8993a8a68bd5d228452a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=tecnologia+educativa+en+la+actualidad+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL.

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.cc/pify?keyword=tecnologia+educativa+en+la+actualidad+pdf
    • http://dokud.apianalosangeles.com/uploads/1/3/1/4/131437736/8398962.pdf
    • http://files.chrisis.org/uploads/1/3/0/7/130738741/8439705.pdf
    • http://files.vintagebandsforhire.co.uk/uploads/1/3/2/6/132681194/dejetezobozojamar.pdf
    • http://dewawed.tiffanyfostersmith.com/uploads/1/3/2/8/132815367/kedewupix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/maratinijabik.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/nokajuvedakitomuvufidened.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/73421080125.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/ez_grader.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/dafofowadegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/23664935134.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/sojipuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3330/files/jatazave.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9803/files/basic_computer_notes_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/xixipurolomoropa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/characteristics_of_art_nouveau_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1511/files/82772508243.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_off0000f95f.bin
24b0a6f83e29de7e4cc66007d98fb5bbb78e34164a7674397dfd7351902862c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 5060 bytes
font_01_sfnt_off00010ab7.bin
9a079447aabb263d9b4bc29b1c836d99b71896cb572eed84ea3faeff386b1d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 11680 bytes

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