Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c66c42c87bc3ee…

MALICIOUS

PDF

66.5 KB Created: 2020-08-18 17:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cfe4cd3d7d94344b647315375e7786df SHA-1: 90e304d18d053f1e01a02b3b547e25d9003cf093 SHA-256: 41c66c42c87bc3ee92480e43519ff90f5d1687f86209552140a55f1eda423760
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains text related to 'factoring trinomials worksheet common core' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly indicated maliciousness.

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=factoring+trinomials+worksheet+common+core In PDF document text
    • http://files.johnbeswickfurniture.net/uploads/1/3/2/8/132815343/083ae4.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/1/0430/7111/1330/files/free_form_filler_software.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/jovejet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/sepeninusodetefu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/audition_form_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4498/6262/files/create_virtual_environment_python_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/30574246022.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1485/5583/files/real_estate_brochure_design_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/kovezemos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/hanuman_songs_masstamilan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/types_of_advertising_strategies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/33186526761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/invoice_template_html_jquery.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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 5324 bytes
SHA-256: f7b854a0291d04efc57c7fe00bad4e5da7669b81611fc4baa386971ad0db7696
font_01_sfnt_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 10864 bytes
SHA-256: 3c68b4ae33b1a881e7535fce14d192a523d5d8968b6e319a99b3695978133786

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