Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33cd7eea3ea8042…

MALICIOUS

PDF

106.3 KB Created: 2020-08-10 01:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5a341df9e02480c1ce4a6b615af1ccd2 SHA-1: 7e4a3edb88fb1e63cd9cfa2abbb9c2559bb11375 SHA-256: d33cd7eea3ea8042a951b12db47c8224fda91d16615791ed0bc8b2823ff6255d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body text. This link is designed to lure users into clicking it by appearing to offer calculus problem solutions. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The primary malicious IOC is the redirector URL.

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=thomas+calculus+problems+and+solutions+pdf In PDF document text
    • http://xodop.shootingstarsholden.com/uploads/1/3/0/7/130775162/6459956.pdfIn PDF document text
    • http://files.projectusandthem.com/uploads/1/3/0/7/130776460/3693691.pdfIn PDF document text
    • http://files.nhlogcabinrental.com/uploads/1/3/1/6/131606733/wiweteselovip_bamanotobuxomep_valafonafovi.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/1/0428/9835/8432/files/87294954422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/zusogepojusorupaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/82033805863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/71520115743.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/34648667142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/xujaziwabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/39513969903.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/how_to_customize_your_discord_server.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/astro_2nd_canadian_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/bible_dictionary_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.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 6

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_off00014861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14861 5484 bytes
SHA-256: c81abb5b65d53e29df5dc106d033295011076918fe4b9068369fbe8c222896b0
font_01_sfnt_off00015ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD1 21588 bytes
SHA-256: 1591f9f894003c96a4f727eedb42ab60ab84f9db5a50b2ffbfc13dc1c1c86424

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