Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca9ea931d0f3171…

MALICIOUS

PDF

72.1 KB Created: 2020-07-30 17:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5137bd032ac5761e93b9637ea7cdcd63 SHA-1: cd0d6c91384b9e83c38c39ea9ef180d0c4a41e28 SHA-256: 8ca9ea931d0f3171fc7e0979d16d93eaea4b3aecdeeff5ffc6ab0655f90b19e5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains multiple embedded links, with one heuristic identifying it as a PDF SEO link farm. The primary malicious link redirects to 'ttraff.ru', which is flagged as malicious infrastructure. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended content beyond the presence of links.

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://ttraff.ru/pify?keyword=borg+breathlessness+scale+pdf In PDF document text
    • http://files.nnhst2.org/uploads/1/3/1/3/131379612/lufuxofuwusuwufaposi.pdfIn PDF document text
    • http://files.renewfurnitureonline.com/uploads/1/3/0/7/130776324/a7aedcd9.pdfIn PDF document text
    • http://files.nenagholympic.com/uploads/1/3/2/6/132682076/wajub.pdfIn PDF document text
    • http://files.themanimalchronicles.com/uploads/1/3/1/3/131381540/0b890e668b.pdfIn PDF document text
    • http://files.hairandmakeupbylu.com/uploads/1/3/1/4/131453588/kirezijukogom.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/1/0431/1167/8114/files/livigezixuxugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/gililewebalari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72274594547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/8726098090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/22857188462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/9216907788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/40340267999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/19100400882.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8566/8255/files/57220386879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/83137306708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6687/4269/files/xelemoxovisifamopofifuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/pebenejisuliguzeziwida.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_off0000b9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 5348 bytes
SHA-256: aa8552ca2ba3f138ca1494b46650be42f08e5802df94e3a51bfcce3f2b85f00d
font_01_sfnt_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 16088 bytes
SHA-256: 0e7d78a6505189486caac478c2a449947bde0cd4c1fcb886aeca79e910730c31
font_02_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 16132 bytes
SHA-256: 0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667