Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d2632c4516770f…

MALICIOUS

PDF

51.9 KB Created: 2020-08-23 00:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cd6788c172edb3840841c54adc01f3b2 SHA-1: 84835e0f4b0b36fcc7ab27ab689ebbc870c27e3c SHA-256: 31d2632c4516770f35ee4a9b8717e6589a5ed7f37a9e33f62d8faf8239d613da
194 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, which is designed to lead users to harmful content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm aimed at SEO manipulation for malicious purposes. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics.

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=hernia+de+disco+lumbar+pdf In PDF document text
    • http://files.newlife.ca/uploads/1/3/2/6/132680962/tamobuxekerezubeposo.pdfIn PDF document text
    • http://files.nelsoneyewear.com/uploads/1/3/1/3/131379485/puwuxazapesetafakezi.pdfIn PDF document text
    • http://zodapat.massagexcellence.com/uploads/1/3/2/7/132712461/visozoret.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/1/0432/3193/6674/files/kurunib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8173/5073/files/33186998765.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonexosorovofevovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/identify_decimal_place_value_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/senior_business_analyst_resume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/xiwuruz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/occupational_health_and_safety_bill_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1835/7669/files/timberlake_chemistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9308/9692/files/70519414239.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/witolaxotisat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/17284943493.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/51506051219.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E65 5404 bytes
SHA-256: 7cd493fd81587ae8452fa3f5df1eabbb4e8a8c322a03cf63e30f4fed1685fa5b
font_01_sfnt_off0000a09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09A 9980 bytes
SHA-256: 399b141773bedf195623c61d1034be4a011e8a285b8b6b29ca6ca498bc1695b3

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