Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a83b20358fc058e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 13:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 14be7a0f7115d98641296e802994848b SHA-1: 346d48d877f1484868c3aa5b91c3a866e1eb2e98 SHA-256: 0a83b20358fc058e704bbbbaa9d00a55a6fd788cea64f61ae42effa1f655828f
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains a URL that points to a redirector, which in turn leads to a PDF file hosted on a benign-looking domain. This suggests a phishing or malware distribution attempt using a link farm strategy.

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/wix?keyword=naming+parts+of+a+circle+worksheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/599f1c_4220f43adba84e609acc1f0fe8b00a3b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5be868_04d15150c29345e8bf0620f85407140d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7d1dc9_a81c397609e940f99c70b0a14faf7798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/80591500886.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7795/8816/files/76822107674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/10962596655.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cb5dea_0871c73382e84ee59377989e342af736.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a64c8c_e0c715410faa4f959f31e4dcaa3326e6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2c8d66_d6fa26a2f17d41ccbc41bcbaffc7c14d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0c41e7_f991421ea0e044f2936f4f2b94551d2f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8b8174a0f62d4c7d876a8ac847d94138.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/57c819_e9d11b0c1c9a4c37a858d3e52d1ead65.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_361361c48d774611bbb67d4743eaf568.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_off0000635e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635E 5556 bytes
SHA-256: 30fbe9c3679c125c8c44142b637804fca1973cd64d4415932ece4d62f35799fe
font_01_sfnt_off0000762a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762A 10364 bytes
SHA-256: 2a1a7916a8a89fae4db07f50538780e7d8bed9231fc92d2b98132350a415670b

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