Malicious PDF — malware analysis report

Static analysis result for SHA-256 1720d74e7208b037…

MALICIOUS

PDF

40.0 KB Created: 2020-08-14 05:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6451cb734bc246bc62a1b65c14debd96 SHA-1: ad8b4548dbab7f2002d8ce8cde5be7dc527f62df SHA-256: 1720d74e7208b0377584ffe5cd3f2df1999bf6bbb0892dd7796b6daeab67599c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating that embedded links point to known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for 'Income tax rules 1962 pdf free download' and includes the malicious URL. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning to improve the ranking of the malicious redirector.

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/wb?keyword=income%20tax%20rules%201962%20pdf%20free%20download
    • http://kakotu.seatonhill.com/uploads/1/3/2/8/132814930/viwewob.pdf
    • http://files.westyorkshirefurniture.co.uk/uploads/1/3/1/0/131070151/6904612.pdf
    • http://kuzizolos.restoreyankton.com/uploads/1/3/1/4/131482975/19159440.pdf
    • http://naroda.globalvisiondata.org/uploads/1/3/1/4/131438729/107be.pdf
    • http://files.mckinnonactingstudio.com/uploads/1/3/2/6/132695294/1341574.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/ispad_2020_dka_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/musirozav.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/22258068675.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/xozenobowabazokogepav.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/9974826170.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/93951768536.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/72736899397.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/47252016137.pdf
    • https://cdn.shopify.com/s/files/1/0428/2315/5878/files/67234854197.pdf
    • https://cdn.shopify.com/s/files/1/0436/2777/4115/files/biodegradation_ppt.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_off00005b59.bin
d27a89639b2ccf23da963d624a547367bfbc5f30d36dde16f0047ae23ea0f698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B59 5892 bytes
font_01_sfnt_off00006f59.bin
2baa25950753125df61d6205163e3c397c059f850760df2ff95d2e3cf5d5ddcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F59 10516 bytes

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