Malicious PDF — malware analysis report

Static analysis result for SHA-256 43764bc38dcee651…

MALICIOUS

PDF

41.8 KB Created: 2020-07-25 16:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: e2870fe078b2e77e6669f593057297b4 SHA-1: 9716d1982748e69e9f47b6aa4cf1ab0fbffe5b99 SHA-256: 43764bc38dcee651735948b47b255d515a36154dfc6f33d54b460ea95b155bc5
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating that it directs users to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of embedded links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to a 'Malaysian pediatric protocol pdf', likely a 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/wb?keyword=malaysian%20pediatric%20protocol%20pdf In PDF document text
    • http://files.cedardc.com/uploads/1/3/0/7/130776592/1748a.pdfIn PDF document text
    • http://files.rubycopper.vn/uploads/1/3/1/6/131606155/6564262.pdfIn PDF document text
    • http://files.vogelnest.co/uploads/1/3/2/7/132740414/9927607.pdfIn PDF document text
    • http://files.drjohnnylops.com/uploads/1/3/1/1/131163666/gusugavu.pdfIn PDF document text
    • http://files.whatsupwellness.com/uploads/1/3/1/4/131454304/543899.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/1/0432/0329/7437/files/72890054035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/fodofubimazowofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9322/0766/files/66135091420.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/19776960244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/94883422807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/94057930218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/9741172918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/51137540912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/kububezasutil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/zisabagodepizavub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/rajifis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5818/2809/files/wimubed.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 6

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_off0000657c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657C 5044 bytes
SHA-256: f09a2862d5ccbd318fc73ea9769cd7226f78e8a978cb4f1f196df98d1d217ee9
font_01_sfnt_off000076ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76AC 10312 bytes
SHA-256: a82ed286769936a39f1081bc69151eb4fab1b6fadccf6e14d13b08c9c2b12f9b

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