Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4ca9ab51d1cb6f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-06 06:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a3cbb38ea8f1d8ab8da176c7b2e23a48 SHA-1: 28b44e5b8d335870c5648607b58cdad2da00b819 SHA-256: 5a4ca9ab51d1cb6fb880ddd3dae0984186a80d0ee6ef29ecc4b4372231c8a1ea
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to drive traffic to potentially malicious content, disguised as a free download lure.

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/pify?keyword=9th+class+english+textbook+pdf+download In PDF document text
    • http://larikigo.wytchwoodshoppe.com/uploads/1/3/0/8/130813108/f55beb649.pdfIn PDF document text
    • http://sejok.happiermomma.com/uploads/1/3/1/0/131070450/5695692.pdfIn PDF document text
    • http://files.fremontbands.com/uploads/1/3/2/6/132682303/gudixezupovose.pdfIn PDF document text
    • http://kesipe.bhambassclub.org/uploads/1/3/0/8/130874284/xomesubewof-rululefeve-fofewoxaz-vazufetigapekoj.pdfIn PDF document text
    • http://nekab.informedelection.com/uploads/1/3/0/9/130969742/somanuxig.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/1/0427/8052/4710/files/dijexevoluxegexawunadaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16481260084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/webemumezufusawu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/40103508089.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/livufidurusiwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/6821/5716/files/basel_3_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8898/6783/files/17786350028.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/76424064168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/wamod.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_off000061f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F3 5744 bytes
SHA-256: ad1ed4d105657fc0b422403c92ba1fc1952cb8771936afe148798a76639553d1
font_01_sfnt_off00007598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7598 9916 bytes
SHA-256: 9b8689d961b3778cf5d29a3464c5061bf8e3509c4e630d41d18babd186dcd714

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