Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1c6f35325b61df…

MALICIOUS

PDF

43.0 KB Created: 2020-09-16 16:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 84064b88df19442143031cc7e28b680f SHA-1: c21ebfb44eaef9beaebb8d22028dd3725ae7e59e SHA-256: ec1c6f35325b61df67c84d603eebef9f80246eef65c92198930da4cea501833e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, which is the primary indicator of malicious activity. The document body, though heavily obfuscated, contains text related to 'Gas behavior worksheet answers' and a URL that matches the redirector link. The file also contains a large number of embedded links, many pointing to shopify.com, but one critical link directs to a known malicious redirector infrastructure.

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.link/wix?keyword=gas+behavior+worksheet+answers In PDF document text
    • http://darebom.iammyowncounselor.com/uploads/1/3/0/7/130738524/gizapej-zivime-tuvama-xibemise.pdfIn PDF document text
    • http://kujijot.80sprom.com/uploads/1/3/1/4/131412032/dba5ff795d7c5e2.pdfIn PDF document text
    • http://files.paulheroux.org/uploads/1/3/0/7/130739517/3966428.pdfIn PDF document text
    • http://files.lancemosherbooks.com/uploads/1/3/2/8/132815220/2663211.pdfIn PDF document text
    • http://files.sarahtorti.com/uploads/1/3/0/9/130969368/newabazu.pdfIn PDF document text
    • http://files.seamstobedone.com/uploads/1/3/1/3/131398184/8a39b9.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/1/0433/5504/6037/files/sri_aurobindo_letters_on_yoga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/22803191357.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/8334557195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/wenatulorogad.pdfIn PDF document text
    • https://b5946bcc-f728-4cd0-8bb7-bb7f2f27a05a.filesusr.com/ugd/f1780b_e719dad299784e44bb3d7729d28d4753.pdf?index=trueIn PDF document text
    • https://90c8a564-a783-4e86-9c77-84e6c71e984c.filesusr.com/ugd/bcc0e4_240dd9d44b564a30a5aa4bf7eb6d1854.pdf?index=trueIn PDF document text
    • https://46039034-48c5-4416-99e8-e55656da1457.filesusr.com/ugd/3f80ec_f87efc5bd78844abba562fcaf7d8a9b8.pdf?index=trueIn 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_off0000699f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699F 5128 bytes
SHA-256: 28230af6cd566e1d7c2ad7a53c010e686d64698d2a8a90ac971c38cff3545df8
font_01_sfnt_off00007b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B25 10472 bytes
SHA-256: d42a2ddd4911c298f57c50f2a3abe0e05afaf6de6d0e38cf630ad3ebd4b579b1

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