Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c24273a81620639…

MALICIOUS

PDF

51.9 KB Created: 2020-10-01 17:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 50488a63dee306116fe24faafa5dd624 SHA-1: e0fc5143d9ffdef7acc0884c77e66eb8e75696d6 SHA-256: 8c24273a81620639e249ce2768ca30379b3e9b50b5b9eeae31bbe89554213efa
194 Risk Score

Malware Insights

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

The PDF contains numerous links to SEO-optimized PDF hosting sites, which in turn redirect to a malicious URL. The document body itself is a lure, presenting itself as a fitness guide but containing embedded links. The primary malicious URL identified is cctraff.ru, which is flagged as a known malicious redirector. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/strik?keyword=biceps+workout+at+home+with+dumbbells+pdf In PDF document text
    • https://site-1039539.mozfiles.com/files/1039539/rafoseb.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/63280851328.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/65476897312.pdfIn PDF document text
    • http://files.lucasregoborges.com/uploads/1/3/2/6/132695990/1114018.pdfIn PDF document text
    • http://files.daisyhillgoats.com/uploads/1/3/2/6/132682254/0e5e6d4f28f1.pdfIn PDF document text
    • http://files.zenmethodphilly.com/uploads/1/3/0/9/130969940/ea27002.pdfIn PDF document text
    • http://files.cuttingedgepoodles.com/uploads/1/3/0/8/130813934/1270724.pdfIn PDF document text
    • http://files.acaccentsjewelry.com/uploads/1/3/2/6/132680867/ce5e4250e1565a.pdfIn PDF document text
    • http://files.nursing311.com/uploads/1/3/2/7/132740701/9b002b1cbc90c9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006add.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006add.bin)
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/80408145909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8442/6645/files/zupediwezalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/french_food_vocabulary_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/nikoxuwaropigu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/83802960146.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 extracted file (font_00_sfnt_off00006add.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off0000ac61.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off0000ac61.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADD 5740 bytes
SHA-256: 5005da9e647b3814c72748ed831b2385c69e4f76c787a12d2d0c77da9620aa1b
font_01_sfnt_off00007e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E48 2660 bytes
SHA-256: f25375f9d145506fd646ea1021c27f396c47852052a1f6b15c40731b26a60aa0
font_02_sfnt_off000089b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B1 10060 bytes
SHA-256: 4e586756fe4a7813adc6940160bd09b9621fda42646ba7ac8f694386e5b34b53
font_03_sfnt_off0000ac61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC61 16304 bytes
SHA-256: 2ec471bc1dd097ba7445d0d98fae4076614f7d308a936bf5c28a382db3fe60d2