Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6431ea00bfaa04…

MALICIOUS

PDF

43.7 KB Created: 2020-08-20 15:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f0099bf7427b121766b27ea9ea65076e SHA-1: 9cd527a861904ba04059f710c0cf895fe5c20c53 SHA-256: 5d6431ea00bfaa0470e0c738845ccaf43e1874672a61338ee8dddc8f68fa9baa
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a malicious redirector. The document body, though heavily obfuscated, contains a URL that also leads to this malicious redirector. This suggests an attempt to trick users into visiting malicious sites under the guise of providing free educational materials.

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=free+printable+addition+math+worksheets+for+kindergarten In PDF document text
    • http://files.thesickleinme.org/uploads/1/3/2/6/132681342/kizipefi_bozopizozuna.pdfIn PDF document text
    • http://files.blackdustsculptures.com/uploads/1/3/1/4/131453645/zukonid.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/1/0430/8670/8893/files/is_nch_software_safe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/electrical_engineering_mcqs_book_by_handa_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0589/5075/files/nasafilejunimazaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1335/8247/files/zisarugoxilorod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/92475595076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/how_do_i_search_a_in_chrome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/serial_aimersoft_video_converter_ultimate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3152/6561/files/delete_watermark_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/sugujujudikuzorev.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 3

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_off00006606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6606 5704 bytes
SHA-256: 940c421a13321826578c7dd342ca61640a464209963d294eafc60be686a75e7b
font_01_sfnt_off00007947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7947 11936 bytes
SHA-256: 83adbd41e8c307ac2f9d980db97adaaf28165ce7c0d9be143b3b578d3cf40e07

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