Malicious PDF — malware analysis report

Static analysis result for SHA-256 649b21e29c50a2b5…

MALICIOUS

PDF

139.9 KB Created: 2020-07-21 08:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fb1c75ff8134d57a12dfffb9f790011 SHA-1: 604a32d79cc8daaea6c329448e4a9ad076864d28 SHA-256: 649b21e29c50a2b56d331e630d3785152d92041b13f7ab7c5205b6f0bac47654
154 Risk Score

Malware Insights

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

The PDF file contains numerous links disguised as academic resources, specifically "trigonometric functions all formulas pdf". One of these links, however, redirects to a known malicious domain, indicating a phishing or redirection attempt. The file's structure and the presence of embedded links suggest it's designed to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=trigonometric+functions+all+formulas+pdf
    • http://files.sigma.graphics/uploads/1/3/0/8/130874615/777792.pdf
    • http://files.ascotdance.co.uk/uploads/1/3/1/8/131871864/ravojomewiwojun.pdf
    • http://files.carmenliuart.com/uploads/1/3/2/7/132710676/seveba-laloruwofujon-botimixuvane.pdf
    • http://files.modelbouwleuven.com/uploads/1/3/2/8/132814977/617caf595de01b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/kolijenixoniwefepefex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/lediripibimifaxamalal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/27356559535.pdf
    • https://pewinutol.files.wordpress.com/2020/07/fawefuti.pdf
    • https://pomurulive.files.wordpress.com/2020/06/51040677797.pdf
    • https://kuvonalu.files.wordpress.com/2020/06/xusozazuwawupuwilez.pdf
    • https://nonepagok.files.wordpress.com/2020/06/51281780386.pdf
    • https://tusemopupoj.files.wordpress.com/2020/07/16601954409.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/67635450085.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/kirupotanojokobamunaweno.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/luvobafodalotaso.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/64837394315.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/69497716281.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/88131128974.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/10279067964.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bf3f.bin
a53e369fa1a86a96513996ca565b1a2765a7cfcf10219473f0c1919af1b3fca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF3F 5304 bytes
font_01_sfnt_off0001d12c.bin
a13da6ce0259b4b9a5b8ab270f2b62a20c54b46527a1e03d8f153c281c1e375c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D12C 17560 bytes
font_02_sfnt_off000208ae.bin
94489626866ba431cd52ac1e49e06f29752d44e30e5256c4ed837f0d25dbf45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x208AE 17000 bytes

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