Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8516d16c71183c…

MALICIOUS

PDF

51.5 KB Created: 2020-08-22 22:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 47514be756c214d0af33022237c4ff60 SHA-1: 33bb788d19e04303e7979191075d69078244aa85 SHA-256: 6b8516d16c71183c6ff9ce422f908c20a624cfbe3c2b518a4f9e72592d31a153
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious infrastructure, masquerading as a resource for 'report card comments'. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several other URLs pointing to Shopify, likely part of an SEO link farm to obscure the malicious destination. The ML classifier strongly indicates maliciousness.

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=report+card+comments+for+struggling+students In PDF document text
    • http://files.awha.org/uploads/1/3/1/4/131437948/dobara_zajefuzar_tipefoxagokof.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/1/0449/4236/0744/files/simple_sql_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5650/2686/files/alanine_aminotransferase_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8856/7706/files/detail_magazine_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/47103434376.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/chirru_kannada_movie_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/coffee_bean_and_tea_leaf_menu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2312/8986/files/gezobogewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/69211838509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/boxuxupuwiximis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/kapor.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 1

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_off00008d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2B 5484 bytes
SHA-256: cf09e5521eed29e5fbb039f329bb54bf0b17e616301736f317c9139be726a436
font_01_sfnt_off00009fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBE 9728 bytes
SHA-256: ea1843d1119e42c28cdd1d4082ae2baa6e88e41e496ee8875361e6e56f61da93

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