Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fe975b5ac144ca…

MALICIOUS

PDF

57.0 KB Created: 2020-10-06 21:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8d89012a808e4ae778c98cc0b12d6297 SHA-1: 609f5e299e77bb5542a73851d6c14bb31e67a713 SHA-256: 31fe975b5ac144cafc4385a932b3e62640601d8d73d1b257cf1fa08e7145d36e
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 external resources, indicating a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector, suggesting the document's purpose is to lead users to malicious 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://gettraff.ru/strik?keyword=5-8+practice+graphing+absolute+value+functions+answers In PDF document text
    • http://files.willowfree.ca/uploads/1/3/0/7/130740344/xiwodufa.pdfIn PDF document text
    • http://files.johnmindeman.com/uploads/1/3/2/6/132681882/zizosisokejusabu.pdfIn PDF document text
    • http://files.swbowbenders.com/uploads/1/3/1/4/131438245/be375e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0490/0795/2039/files/53320130602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7973/6223/files/66071885326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/head_soccer_mousebreaker_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ed66a1-227e-4463-b841-3f4b8187e766/47755749056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c88b9ef-6bad-4854-840e-e117f53fe71c/febegapiwinunoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3958d8b5-9d89-44fa-a3a8-fd7b696ed484/xugafonujiwobatuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5341/6601/files/17035034475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/run_c_program_in_terminal_windows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9048/1830/files/bemuna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0271/6572/files/81556157924.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4D 5824 bytes
SHA-256: 31f6adbd1f4d17f3c3d7f576906edc5d0780ca50b786ca7c3b5bff3d8c28d602
font_01_sfnt_off00009036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9036 15640 bytes
SHA-256: ef1872390f8d017da8f32f1e01cd59a1d7b85c0cc4d4656d70854cadc649dd91
font_02_sfnt_off0000c1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 16112 bytes
SHA-256: 6bfd663be811f4c0caa16031a69679ba2b5a79eca72185f30448f1bd3e23166d

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