Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a47bf255ba9028…

MALICIOUS

PDF

46.1 KB Created: 2020-07-23 09:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8157cede6f41bc57ebf146b986ad68a0 SHA-1: 7dbf581e59fd7e58e35820865237c52ea3c26d2e SHA-256: c8a47bf255ba902810f377011651d18b23d9b8c33f77419f106faf2fb1e39843
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to a known malicious redirector. Another critical heuristic, PDF_SEO_LINK_FARM, highlights the presence of a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to 'effective teaching strategies in mathematics pdf', likely a lure. The primary IOC is the malicious 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.com/pify?keyword=effective+teaching+strategies+in+mathematics+pdf In PDF document text
    • http://files.joeyessmaracing.com/uploads/1/3/1/8/131857758/7490982.pdfIn PDF document text
    • http://files.edumentality.com/uploads/1/3/0/7/130739263/80d4ea135f2adb5.pdfIn PDF document text
    • http://files.jenkatz-buonincontro.com/uploads/1/3/1/3/131379099/tevib-judexosedu-dejosekapuva.pdfIn PDF document text
    • http://files.auroralutheranbiblecamp.com/uploads/1/3/0/8/130873949/2145838f3.pdfIn PDF document text
    • http://files.thevasculargroup.co.nz/uploads/1/3/1/4/131438490/pubiwekikorepus.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/1/0432/1312/7835/files/xakimivinuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/feligesedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/72583191143.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/14612746424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/48659080889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/nijobupufixewigim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/wojeluvefijasix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7631/2478/files/gofad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/53400407943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/90035391732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/19681660781.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/90212367097.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 8

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_off0000776c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776C 5232 bytes
SHA-256: a673d9bb3f64129182984ac11cf9d5a8aaa032762b16cfd832453e95a2286394
font_01_sfnt_off0000890d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x890D 9948 bytes
SHA-256: 02eb0adebec6df468de0b885fc68b6586e9d73dbf7be68072639b1422c126fe0

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