Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5bf041ee81a156…

MALICIOUS

PDF

44.0 KB Created: 2020-08-11 23:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 86a4ebe6b81e0a9a94e0bdd60d62a816 SHA-1: 0b8687b07ce05cc9db7a08f3fdc7a479a0ab30cb SHA-256: ca5bf041ee81a156ccb188b348661834c7da477b72c4b91fe529d33a3b463169
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Dompdf autoload. inc. php missing' and includes the malicious URL. This suggests the document is designed to trick users into clicking the link, leading them to a malicious site. The presence of many Shopify-hosted PDF links, while mostly benign, serves to camouflage the malicious redirector.

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=dompdf+autoload.+inc.+php+missing In PDF document text
    • http://jokom.karraschconsulting.com/uploads/1/3/0/7/130740072/2523507.pdfIn PDF document text
    • http://vemotu.pennlawlambda.com/uploads/1/3/2/7/132712615/dasazorena-wuvolaxoxa-zedewerore-nabem.pdfIn PDF document text
    • http://pexolaxa.historiaflorals.com/uploads/1/3/0/8/130814328/pigerepeta_totoxamuzugutap_sebeliboxupa_wuridififema.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/1/0432/4546/9858/files/el_zorro_astuto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lovukapovilelogitolosir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/59554831347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/4537/6420/files/convert._ai_to_png.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/juremepuzipak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/juki_sewing_machine_parts_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/sufugit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7460/7514/files/jurnal_skripsi_akuntansi_perpajakan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/python_caesar_cipher_decoder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zosogorimojafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6961/1930/files/mesezakesinesogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7874/6261/files/somuwidepojikejime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6291/0376/files/jepozowotoliwexegamur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/xobesejajoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/rerivatafevasagewuxuxivuw.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_off000065e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E7 5504 bytes
SHA-256: fd3d0f327684abcf3cc95869fe394894fcbd9e1daf8eed3ba326e1a6cec72786
font_01_sfnt_off00007880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7880 13064 bytes
SHA-256: 0a233c6f8c566ade9b1dc1b066484ad429903229a74cd89c692f79f632c1c040