Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4a20fd68c8ab61…

MALICIOUS

PDF

40.2 KB Created: 2020-08-06 04:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f64fc611bc2a6a879dd786cd581ac37f SHA-1: a42bda5c809f1fd8ca44cd257c11cf9f7cbdcabc SHA-256: 0c4a20fd68c8ab61d3592a46b0e1a2ef3078f1a43746636d562793aaa07e0fbb
194 Risk Score

Malware Insights

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

This PDF document contains numerous links, many of which point to a redirector infrastructure known for hosting malicious content. The primary lure appears to be an 'informal letter' that, when clicked, redirects the user to a malicious URL. The ML classifier strongly indicated maliciousness, and the presence of multiple SEO-optimized PDF links suggests a phishing or scam campaign.

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=informal+letter+english+pdf In PDF document text
    • http://files.lakeelmojaycees.org/uploads/1/3/1/4/131409508/vetefogafaxexonaperu.pdfIn PDF document text
    • http://files.hudsoncobras.com/uploads/1/3/2/6/132695352/1898339.pdfIn PDF document text
    • http://files.snaggletoothmf.com/uploads/1/3/1/4/131453695/tejaporolulagi-jemoxaz-pirazodo-logoxinonax.pdfIn PDF document text
    • http://files.ronyahperformingarts.com/uploads/1/3/0/8/130873971/zilobin.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/1/0430/6803/1143/files/jetexorigumol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/33254299564.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/tivajakarivew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/29026192620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7393/6291/files/61446762507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8845/2515/files/sobowopowopovalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5989/4682/files/61768793585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/45459827120.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/kivowuzumubabeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/padiwuritamibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/zikiro.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 4

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_off00005e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E24 5392 bytes
SHA-256: 5fe1d5183c69aed54fb5e1db72df80ab18c6387d81178e18a752729b15186fe5
font_01_sfnt_off0000704f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704F 10504 bytes
SHA-256: 31691539875ebcacf576fbfdbd1a3eaabf30d6143266265e74c2538270fe2bfa

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