Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab7c2fd23d34f68…

MALICIOUS

PDF

42.1 KB Created: 2020-08-10 03:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: add5ef6124e8c90bab5aebc395c029fb SHA-1: 605d6986060d83bae3e96c8305d6d6101d5dce34 SHA-256: 0ab7c2fd23d34f68701564e51e324522f44c4ffa772bdd92fcccad64463ca9cc
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 a link farm designed to manipulate search engine results. One of the primary links directs to a known malicious redirector infrastructure, indicating an attempt to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=aulas+de+frances+para+iniciantes+pdf
    • http://wufilaj.carrollswcd.org/uploads/1/3/1/8/131856257/zuvar_lofuka_lulukutotu_wasamozaso.pdf
    • http://files.redtreefarmstead.com/uploads/1/3/0/8/130874523/zudeles.pdf
    • http://files.spotteddairyair.net/uploads/1/3/1/0/131071137/6c75aa1a.pdf
    • http://ranuguwo.chazhearne.com/uploads/1/3/1/4/131407067/769a5b74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/zajetopawimatevifum.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/witeram.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/83318297297.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/98147188921.pdf
    • https://cdn.shopify.com/s/files/1/0450/2398/5828/files/various_branches_of_science.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/33023309612.pdf
    • https://cdn.shopify.com/s/files/1/0429/5622/6716/files/43237467806.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/xidamukadazokunoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6753/1673/files/60686907197.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/88948704984.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/42726174983.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_off00005765.bin
383f4b45faa7a0efe574ef35ba15e6ed51a64caaae43dc84ddb94152eb1def04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5765 4912 bytes
font_01_sfnt_off00006814.bin
d5536b763c02a41d6f91ffb0a5b79597dc7f5c9bda394cf92ec631ce6a3dae25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6814 12124 bytes
font_02_sfnt_off00008d58.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D58 4324 bytes

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