Malicious PDF — malware analysis report

Static analysis result for SHA-256 838ef885b00df6cd…

MALICIOUS

PDF

47.3 KB Created: 2020-08-14 05:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 28a735a7678bdc8d5f57c2323115eafc SHA-1: f9718eb8cf88b33cbde87062382b44373bac12f7 SHA-256: 838ef885b00df6cd623cb8596872d2b7536be5994f02bcd3a6111db18308ad6a
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, disguised as a lure for textbook answers. The ML classifier strongly indicated maliciousness. The embedded URLs suggest a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

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=edexcel+c4+maths+textbook+answers In PDF document text
    • http://files.littlesunshinespreschool.com/uploads/1/3/0/7/130776131/3a54db06f.pdfIn PDF document text
    • http://files.1enchantedcraft.com/uploads/1/3/1/0/131070394/tamodubog.pdfIn PDF document text
    • http://files.paradiseprintsfashion.com/uploads/1/3/2/7/132712306/3c186a93c6b.pdfIn PDF document text
    • http://files.scottwilson3dartist.com/uploads/1/3/0/9/130969776/a03e9.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/1/0430/6072/3865/files/20347302553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/futelebojesebigirodisujor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/dinonidupewisuwexakasud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2278/5444/files/26021168063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sexewagufik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/fitixosulopiviwineb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/zumik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/67309220776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/lyman_turret_press.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/vinofipub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8110/9405/files/10551129491.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 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D37 5588 bytes
SHA-256: fa9dc2291a5765a235723f887e99b7c466642b4f4439217f6c84b10410eff138
font_01_sfnt_off00008020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8020 3176 bytes
SHA-256: 86f0008032937d8cd80ca1aa0e0ab466faad2f614625b205a638e9dbaa66bb86
font_02_sfnt_off00008caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAA 10232 bytes
SHA-256: 15870632ee67d9e1e9de7f6ae9247f8f36eb5a4e782deca9fd80af6d6814d4bd

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