Malicious PDF — malware analysis report

Static analysis result for SHA-256 158e6458b3fba909…

MALICIOUS

PDF

44.2 KB Created: 2020-08-15 18:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c442b7774169be76e55126fa008747bf SHA-1: 2baee561c8c83de7185e45e01a3a3003b0f571a2 SHA-256: 158e6458b3fba9096024502c3b639c1cc4fb7130896842553b04dcd532d9c86a
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirectors and SEO link farms, indicating a malicious intent to manipulate search results or lead users to malicious sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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=eduardo%20garcia%20maynez%20libros%20pdf In PDF document text
    • http://files.junkim666.com/uploads/1/3/1/8/131856318/davude_wuxuzokimilu_pepuwovad.pdfIn PDF document text
    • http://files.spencerscustomwood.com/uploads/1/3/2/6/132681884/fakedemetiwojezad.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/1/0438/2041/7181/files/marketing_strategies_for_agricultural_products.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/delukaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0917/1879/files/zozevupoxunokelanezugul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/wind_dragon_summoners_war.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2696/4895/files/4348936149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5693/8658/files/writing_inequalities_from_word_problems_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/94861591937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6137/9221/files/nokowatiwevivubopave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/35982621609.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 4

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_off00005ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF5 5724 bytes
SHA-256: f1afd9e0321648bf38622adf4a8f10672e047c37cd38681425cb9dd91fc0a394
font_01_sfnt_off00007265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7265 15868 bytes
SHA-256: 3a3e647c7c923b265616745fee2a78ae6d072a9b80fd1c2bb51ecc4406881bc8

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