Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05fa574b0781ce4…

MALICIOUS

PDF

42.6 KB Created: 2020-10-01 01:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d74a7f9118606e50052f9bf1cd10dc90 SHA-1: 76de8f0731b7cf6a786ad1d29b18eed3f3248678 SHA-256: a05fa574b0781ce4aaa04d30d720fc0de79e4c97fe2d1d6e861beb00e39a3fc1
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spam campaign. One of the primary links directs to a known malicious redirector, indicating an attempt to obscure the final malicious destination. 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=cassia+angustifolia+vahl+pdf In PDF document text
    • http://riwukid.glitzstudiodesigns.com/uploads/1/3/1/8/131856554/pejugawuzoge.pdfIn PDF document text
    • http://militij.the3wows.com/uploads/1/3/0/7/130776763/30b0ccfa7efe.pdfIn PDF document text
    • http://files.hopevineyardowosso.com/uploads/1/3/1/6/131637056/bamesafudot_zinevu_wejofotumixozux.pdfIn PDF document text
    • http://bogovi.sajad-saeedi.ca/uploads/1/3/0/7/130739291/182032d9a.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/57315640803.pdfIn PDF document text
    • https://site-1037886.mozfiles.com/files/1037886/79851206168.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/pekaxejutusavowimikomiz.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/29095380230.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/vodemej.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/1/0433/0238/7867/files/investor_pitch_presentation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8334/9668/files/dezunupubepebaxog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4021/0072/files/channing_tatum_shirtless_cardboard_cutout_magic_mike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3788/7144/files/xolodazudos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2266/4348/files/88180049137.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 5172 bytes
SHA-256: c397baa1372c74d2fa8441def12126eb9a0b20e74b2845907c206bcc26d84949
font_01_sfnt_off00007433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7433 12984 bytes
SHA-256: c37d6b9358d3e8f545cfe98d00b210ab75d48ab8d92e5ec5ecc011cc7474ad3f

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