Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bde30034bfe0bd5…

MALICIOUS

PDF

40.8 KB Created: 2020-11-06 15:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 19e900425484b4587c422deccd0c0880 SHA-1: 48bfc81177b26b9fc21b50851d1e79eb659e4421 SHA-256: 9bde30034bfe0bd5016b53accca6ba5108ba49165f98bb9f5cbd4c3d77e7f3f5
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple links to redirector infrastructure, specifically pointing to 'traffine.ru' with a keyword suggesting a software crack lure. The presence of a large number of external PDF links, many of which are SEO-optimized, indicates an attempt to distribute malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to 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://traffine.ru/strik?keyword=spotify+premium+crack+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_5fa4ca8493321.pdfIn PDF document text
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/kodamol-xavabokaker.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/nilesov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_5f95768d38efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f90e4946f8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5fa030aca6c9a.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/2568472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/temperature_conversion_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cfe0ca-ddc5-445c-a6e5-f02f7ae0f30e/bulowot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b06c2af-5a6e-43b6-b854-ae94672ef721/toroperatus.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6093 5220 bytes
SHA-256: 6acba97fafd76fc86367f9c8ed0d8089aef72bbbc5a2592fe45bb4e046191740
font_01_sfnt_off00007258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7258 10680 bytes
SHA-256: 90c7cdaeb559210a514666d6adcb73714a114cd2e416b1dc8d8d3a8e3ee27f66

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