Malicious PDF — malware analysis report

Static analysis result for SHA-256 671b13ccb23a1f96…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 08:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 35ccd87548395960f3fe8ae6f0e10cc8 SHA-1: 4b043d5175f0fe0ed0d73e8f04e90f3c57b8e18e SHA-256: 671b13ccb23a1f969aae3dba6c31c07f98813d45b96a9078e2dfe1ce98742f6e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that redirect to a known malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'Chernobyl disaster report pdf'. The presence of numerous external PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely for SEO manipulation to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=chernobyl+disaster+report+pdf In PDF document text
    • http://rabelelud.radiantmothermassage.com/uploads/1/3/2/3/132302942/337101.pdfIn PDF document text
    • http://files.badmintonsouthaustralia.com.au/uploads/1/3/0/7/130739802/2804657.pdfIn PDF document text
    • http://files.pipain.com/uploads/1/3/2/7/132740763/857198200bd6.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/1/0432/6552/3870/files/siwipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/horn_of_the_brown_wolf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/1526123691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2827/3557/files/child_anxiety_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/mofafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3446/0828/files/70525597507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2700/4577/files/26897357462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/46889038536.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3573/5717/files/31083502894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7795/8822/files/kenokiforumawip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/78767504607.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 3

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_off0000662d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x662D 5276 bytes
SHA-256: 4423644a2190e3e240e5bdf07352a87cd93086db4539a013bc4d6599213900a4
font_01_sfnt_off0000780e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x780E 10256 bytes
SHA-256: 30f7f97a6a9d57924be16e771370bec7dc2da633308fd6eee364437b283c8fa7

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