Malicious PDF — malware analysis report

Static analysis result for SHA-256 435d0e940de07449…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 22:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 02763527aeb8039c4d93472115a4d1c1 SHA-1: df6fc149c087f9d8620719474cd8f9f4ffb7feba SHA-256: 435d0e940de074492dfe2c5af38bc44abc91f28fd0c0cd06f63584ce73d0ccbc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, suggests a lure related to educational worksheets. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/wb?keyword=three%20levels%20of%20government%20worksheet In PDF document text
    • http://files.lifelonglearningpath.com/uploads/1/3/1/4/131454620/lalakeruwo_buvununefen_tuwejipitakix_nilol.pdfIn PDF document text
    • http://files.tplsongwriting.org/uploads/1/3/0/8/130874265/29c81f871.pdfIn PDF document text
    • http://files.pattiek.com/uploads/1/3/1/1/131164097/wixewigobudu.pdfIn PDF document text
    • http://vupijef.monumentblog.com/uploads/1/3/1/4/131482995/seliwokudenigajob.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/1/0440/1951/5557/files/13106873958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1362/7294/files/53705148770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/causative_upper_intermediate_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/melefizigadilogijud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/29880525659.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0596/7527/files/65890213594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/96806730804.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6549/1106/files/maponunujat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2411/3049/files/school_newsletter_samples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6403/2422/files/grb_objective_zoology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/3798/5690/files/collapse_of_bretton_woods_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/xuvikuwopakanonepufebuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/daoc_midgard_leveling_guide.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_off000065b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5136 bytes
SHA-256: 3dc185ea52fd097a68e2767d3e017d9ddb85d76691d345abcdd49f67eb18f2d1
font_01_sfnt_off00007721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7721 10240 bytes
SHA-256: e9589bf743dc314395cc2e237e5cca9d22082e5985da03698f8d49e408c7a930

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