Malicious PDF — malware analysis report

Static analysis result for SHA-256 61821dff572d7732…

MALICIOUS

PDF

41.3 KB Created: 2020-07-31 19:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6332c660af33edc7e8826caaf4a8dabd SHA-1: cc08bc9bfdf30e43d468e620eada36f2b8e1282e SHA-256: 61821dff572d7732334c943b7e5c171e8ca80aa426c0adbecec80ff911043133
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a high likelihood of this document being used to direct users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious payload or phishing page.

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=dcs+a10c+startup+checklist In PDF document text
    • http://files.ustars.org/uploads/1/3/2/8/132814196/fibal.pdfIn PDF document text
    • http://files.omgillian.com/uploads/1/3/1/4/131453124/9114432.pdfIn PDF document text
    • http://files.olivetcongregational.org/uploads/1/3/1/1/131164198/nuwabitigate-bujuka.pdfIn PDF document text
    • http://files.rosecitytrombones.com/uploads/1/3/0/7/130775939/ritipoga.pdfIn PDF document text
    • http://files.cantonbeachpaddleshack.com.au/uploads/1/3/1/1/131163943/zedujogikofa.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/1/0430/4545/3985/files/3589085676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9289/4115/files/96316755758.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/lemafes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/kovoluvawipun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5578/2817/files/57274404254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/81679905018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9880/8224/files/54233502301.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9794/7288/files/18184752420.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/zomaxipofugenune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3464/7451/files/puper.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 8

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_off00006289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6289 5280 bytes
SHA-256: f7757adf17dbb38e337823d253d2809004cda3d63c29ed166a8c60f2754895db
font_01_sfnt_off0000747f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x747F 10964 bytes
SHA-256: ff4aa6ef3580b854d1bbe472514dd7d47e9f7deae5bf3deeb33ef8bb492c0966

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