Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b53509683c83a55…

MALICIOUS

PDF

44.0 KB Created: 2020-07-13 23:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: c643fe2a899f6847923d3a0a891806dc SHA-1: 1805cc18f906d391271401afdb0a1217cd2c5e58 SHA-256: 6b53509683c83a55bfb7dd58fef9c5c165aabf3e4d1fb7f77a480914eeebebb5
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'drug abuse statistics 2018 pdf'. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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.com/wb?keyword=drug%20abuse%20statistics%202018%20pdf In PDF document text
    • http://files.vicenzas-crostoli.com/uploads/1/3/1/4/131483253/9062675.pdfIn PDF document text
    • http://files.squareonegoodsco.com/uploads/1/3/2/8/132815154/tasawaz.pdfIn PDF document text
    • http://files.adelaidechickensittingservice.com/uploads/1/3/1/8/131857071/wovakemeluwo-bokevanukapaku.pdfIn PDF document text
    • http://files.lrse-nd.org/uploads/1/3/0/8/130814235/3159325.pdfIn PDF document text
    • http://files.kitleway.com/uploads/1/3/1/6/131606335/rabezeral.pdfIn PDF document text
    • http://files.dvfk.org/uploads/1/3/0/7/130776298/fekodutodova-tagap-tanej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lenenuk.files.wordpress.com/2020/07/3101315139.pdfIn PDF document text
    • https://wubejirowa.files.wordpress.com/2020/06/75883165276.pdfIn PDF document text
    • https://giduwifun.files.wordpress.com/2020/06/32561896255.pdfIn PDF document text
    • https://vumutigul570287057.files.wordpress.com/2020/06/29642857883.pdfIn PDF document text
    • https://gozikes.files.wordpress.com/2020/06/80938426260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/gafiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/soteferododifotulilax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/kesupulujaguxisegukaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/wupujalil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9908973296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruxejuvekega.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_off00006d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3D 5616 bytes
SHA-256: 6338ebe6fba8f2f2a73281697dfd8fd72fc171b7559d423249fe9bce8e210354
font_01_sfnt_off0000806e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806E 10136 bytes
SHA-256: 8c6b323fd23eaf5f2c88625fa9f12e981577e957f41ac342c5e61a50c5b7da4a

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