Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bae6cfce788cca…

MALICIOUS

PDF

52.1 KB Created: 2020-07-10 19:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 719203cda948afc0ae7e2b2c2822cb7b SHA-1: de0c9fb2f3ffcac9787cdba22bc0ff6708e02ee6 SHA-256: 50bae6cfce788ccabb3b919344afbd8d95d2d73607562b9345f391656fd4ca09
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, identified as a link farm, designed to redirect users to external sites. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though obfuscated, also contains these URLs. This suggests the primary purpose is to lure the user into clicking malicious links, likely leading to further compromise.

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.ru/pify?keyword=carcinoma+de+pancreas+pdf In PDF document text
    • http://files.oace.co/uploads/1/3/1/3/131381781/parotakime.pdfIn PDF document text
    • http://files.fresnonutritionsolutions.com/uploads/1/3/2/6/132683111/9806049.pdfIn PDF document text
    • http://files.vintageorders.com/uploads/1/3/0/8/130873907/3e8f3.pdfIn PDF document text
    • http://files.tlhinspired.com/uploads/1/3/2/3/132302966/tivuxa.pdfIn PDF document text
    • http://files.westvillageclothing.com/uploads/1/3/1/3/131380094/a609d92.pdfIn PDF document text
    • http://files.sarahrosepeterson.net/uploads/1/3/1/4/131438439/tiwoxekofoze.pdfIn PDF document text
    • http://files.tealthreads.com/uploads/1/3/1/6/131637325/benaleg-dexejogitusi-dawipafujero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://reveposox.files.wordpress.com/2020/06/17830255450.pdfIn PDF document text
    • https://duvonufoge.files.wordpress.com/2020/07/54557996199.pdfIn PDF document text
    • https://xalidabi.files.wordpress.com/2020/06/befagalux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84602765162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96617946950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tujekozovazufurujujazer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54183348773.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 8

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_off00008f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F36 5000 bytes
SHA-256: a406121a6698f61642cf0260290b0de4a87c1aedfa4162ac159cf1516d3c06f8
font_01_sfnt_off0000a010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA010 10448 bytes
SHA-256: 1d7267776427a20afcf9524716f420abf73bea90cb2446d6f248c0c0c28451d5

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