Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3999da0f9341d4…

MALICIOUS

PDF

43.7 KB Created: 2020-08-17 06:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4e7fdf8b1de36d859ea692c48ccd53a1 SHA-1: 568c4f3eb00eb6e22dc69cc9471b16d43180f92a SHA-256: ca3999da0f9341d47b8e029f8cb4572e537d00ce56650c95523ec2c93ec71738
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=rural+development+class+11+questions+and+answers In PDF document text
    • http://mudokani.aexist.nl/uploads/1/3/0/8/130873995/88a0d9c1c7.pdfIn PDF document text
    • http://files.dolphinrealtyhatteras.com/uploads/1/3/1/3/131398140/9293780.pdfIn PDF document text
    • http://retiwew.cydneyuffindellphillips.com/uploads/1/3/0/7/130776542/3610950.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/1/0434/4204/5090/files/60416713106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7210/2301/files/toefl_test_preparation_kit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2583/3882/files/37584745316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/jurefivowi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6260/6489/files/72701341562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2097/4242/files/7607699697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90379225571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/cataract_journal.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_off00006bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAE 5556 bytes
SHA-256: 5b7807758843f11b1ebb1c499989c111220111d96452773fcc57745cb4006488
font_01_sfnt_off00007e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9D 10436 bytes
SHA-256: 964c7216fba612400cfb928b7778e265f1ca646cd43ab063b8f4e0b67663acd7

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