Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1e871fec1b83d3…

MALICIOUS

PDF

33.6 KB Created: 2020-08-12 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4b52e0a33e7dc8b617550fa22885c1f2 SHA-1: 7c416a0500f35a01e0569699fda70ec8deb4be10 SHA-256: 1a1e871fec1b83d323d43f07f2c3e9bc8ae66bee4e079450ac39abb66901eb14
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with SEO link farms. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to electronic circuits and a URL that appears to be a lure for a free download, which redirects to a malicious site. This suggests the document is designed to drive traffic to malicious sites under the guise of providing a free resource.

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.ru/pify?keyword=foundations+of+analog+and+digital+electronic+circuits+pdf+free+download In PDF document text
    • http://files.teninabedtheatre.com/uploads/1/3/0/8/130813799/tinidu.pdfIn PDF document text
    • http://teferejo.gwengunterart.com/uploads/1/3/1/4/131409090/d1c35d48.pdfIn PDF document text
    • http://files.marine-intl.com/uploads/1/3/1/4/131411024/42089bfa09f.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/1/0438/5662/5829/files/vunewem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8761/7436/files/55233060565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/application_of_buffer_solution_in_pharmacy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1306/3327/files/persona_3_fes_fusion_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1796/9570/files/48834579277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/water_billing_system_project_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9246/6080/files/sakeraxujegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/6720357776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/catalogo_productos_aceros_arequipa.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 2

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_off000041a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41A5 5372 bytes
SHA-256: 468a251dd444a5db450c8289448431fc88400fd6d6bb3f87370d4a98833ca28d
font_01_sfnt_off00005411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5411 10180 bytes
SHA-256: ce8d7c704087d5170ffc79e6f74cf7c3fdc8e6893bea9c68d8c755a659be6851

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