Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dddf639b9778d44…

MALICIOUS

PDF

34.8 KB Created: 2020-08-12 05:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 954a202b0e25d8e88618a566b09e02e4 SHA-1: 8906a2061297d06dc795019104c26bb6074afebc SHA-256: 5dddf639b9778d44fefde99879e2aa4b3287bb83be3b204835656d005ca3e7c1
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a malicious redirector infrastructure identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body and embedded links suggest a lure for educational materials, likely to facilitate phishing or malware distribution. 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.cc/wb?keyword=fundamentals%20of%20physics%20solutions%20manual%20pdf In PDF document text
    • http://nukup.susanedwardsartwork.com/uploads/1/3/0/9/130969762/8419827.pdfIn PDF document text
    • http://files.writeaboutjesus.com/uploads/1/3/2/8/132814544/da429b89a55.pdfIn PDF document text
    • http://files.countrychicksoaps.com/uploads/1/3/2/7/132712358/dufekaweni-budile-gilobemoniz-pomewed.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/1/0433/0687/7080/files/1741436775.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/93313665328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8243/9063/files/algebra_2_textbook_mcdougal_littell.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/na_step_working_guide_step_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/58945951992.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3799/8754/files/afspa_kashmir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/50910172147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/15371461825.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/53524865367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/antecedentes_de_diabetes_gestacional.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/birth_by_sleep_melding_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 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_off00004c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C01 5356 bytes
SHA-256: 25df205d6a7c5db554fdabbfba48e75ad17d29fa9345921791eb27e713057f47
font_01_sfnt_off00005e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1E 9476 bytes
SHA-256: db057e170236db330e8d6d5f01ff8ddf4b8c9de01fcfc96c0a9805c32e35cc02

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