Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bb259d413fb52e…

MALICIOUS

PDF

45.1 KB Created: 2020-08-08 10:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 80d889e6842b3c95fc2fd82aeacc1859 SHA-1: d34a8863641b6415de6c3fa55fa940a4de947299 SHA-256: 28bb259d413fb52ed3bda81215321cf17f27addd2f3eb4cbff7860a4f037b717
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the string 'Universal antidote pdf' and the malicious URL, suggesting a lure to trick users into clicking through to potentially harmful content. The presence of a link farm further supports the malicious intent.

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.cc/pify?keyword=universal+antidote+pdf In PDF document text
    • http://files.academiapaphou.com/uploads/1/3/2/6/132681415/8522697.pdfIn PDF document text
    • http://files.martienvanzuilen.com/uploads/1/3/1/1/131164488/rukavasatigomuw-mopoxegaj.pdfIn PDF document text
    • http://files.m4detail.com.au/uploads/1/3/0/7/130739544/xapawexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/gupofarunapewojareras.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/99261092187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/cervical_spondylosis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3350/8512/files/29067263206.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/resatibofebuxijuwarekex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0409/0792/files/voladuwalukokagutamedofig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82505274200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6771/8309/files/xutop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8371/7015/files/pawososogadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/zibolijulotinagatumudone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1097/4108/files/83170851900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/70349667502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/writing_equations_from_graphs_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000612b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 4876 bytes
SHA-256: 85133c23b17f37004be56e48552af916c266b1f00393513dfa916e48486cb821
font_01_sfnt_off000071c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C9 11964 bytes
SHA-256: 98581d5ca46c6c6be18f6c0d45bcdd81fe5625d74604b90bad1fcb6887599f7a
font_02_sfnt_off00009969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9969 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378