Malicious PDF — malware analysis report

Static analysis result for SHA-256 051e21d4ea44dd2e…

MALICIOUS

PDF

33.3 KB Created: 2020-08-07 05:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 16157cec8803ab8eaaefff9ccb61941c SHA-1: dea7e2a6a3ee7e7a8a55e41a0e5a83521eb072bb SHA-256: 051e21d4ea44dd2e5b9d8d721a8303001b31bae1a13ec6baa44f6450fcda4e48
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a primary redirector URL associated with malicious activity. The document body, though heavily obfuscated, contains text suggesting a 'free download' lure, aligning with the heuristic findings of a malicious redirector and a link farm. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing or content-luring attack.

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=candy+terry+southern+pdf+free+download In PDF document text
    • http://files.octavesprogram.org/uploads/1/3/2/3/132302768/c578d49ce.pdfIn PDF document text
    • http://files.pacalumnifoundation.org/uploads/1/3/1/3/131380297/6603206.pdfIn PDF document text
    • http://files.brokenknucklekustoms.com/uploads/1/3/1/3/131380316/808589.pdfIn PDF document text
    • http://files.davidpaap.com/uploads/1/3/0/8/130873983/2892012.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/1/0432/3491/8558/files/ratinekelegozupowalelarib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/zimemisivoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2565/2117/files/25648978197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2677/5196/files/50361205475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xixuvedivikeror.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/64184024884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4100/4443/files/16114159585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/bunuxilubesowudamagoguroz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/45262124352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/41220826115.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
🗂 Part of campaign: brokenknucklekustoms.com 3 samples

Related samples 5

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_off00004515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4515 5228 bytes
SHA-256: ec11059c68f860a0cdd78afd0c4f65642a6c4cc202f35681d91eb5ddbf0964be
font_01_sfnt_off000056f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56F0 9792 bytes
SHA-256: 08807e77c2df2875d2efc97e9d7200b16f772f4873b69f6c0332ef1f6bc9074b

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