Malicious PDF — malware analysis report

Static analysis result for SHA-256 528fdcd85f9c3272…

MALICIOUS

PDF

39.0 KB Created: 2020-08-13 00:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5eb431db506b8335ed742e111d043032 SHA-1: 258c6d835fadb4b57e6015cbc5b0dbb9113accb7 SHA-256: 528fdcd85f9c3272b3743e4003b3bac3753e9d912f6799e240166dedf0a4fef1
194 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text "Cdsco guidelines pdf" and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, many hosted on cdn.shopify.com, which are likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=cdsco+guidelines+pdf In PDF document text
    • http://xazatedax.kwdllc.net/uploads/1/3/1/6/131637814/6274486.pdfIn PDF document text
    • http://files.joplatesnweights.com/uploads/1/3/0/8/130814926/pisusonipeleti_bewegatukarokok_vokikima_bolerebaresopuf.pdfIn PDF document text
    • http://files.phsdbteam.com/uploads/1/3/1/4/131407958/682254.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/1/0428/9835/8432/files/telisupuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/43325130570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/rokekupizefumapaganuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8456/3110/files/how_to_unhide_a_post_on_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/69282585011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/2914/7293/files/psychological_assessment_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/bupixetibipowonewipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/xatadepesurekapadipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/18708983069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1446/3386/files/tufipat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/fiwotuwobod.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 7

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_off00005c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C60 4924 bytes
SHA-256: a00ce808a472e40449a3c5a374c0e67d4d3a221537ebb63fd41ab8549f5410cf
font_01_sfnt_off00006d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3B 10108 bytes
SHA-256: 18c905fb382146ee7accab51d0aa8bcdf545125c41e6903b83025b9feb762e0e

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