Malicious PDF — malware analysis report

Static analysis result for SHA-256 f421bbef4b5fed37…

MALICIOUS

PDF

48.0 KB Created: 2020-11-01 00:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: c34ff0ec6b58279cece4bdd8d29bd93c SHA-1: 91ccafeb02a5ea3b526717985086577ad5c9ee29 SHA-256: f421bbef4b5fed37c0fd5a3d2fc7512230d547ea91138a2287f2ab07aa7a60b2
194 Risk Score

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.me/123?keyword=pr+internship+description In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5f9de5d59b7c6.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/1377815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_5f958e97cb541.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/jedaxopopuko/24382697370.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/mekuvegafoboduxifuxij.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/byu_family_history_library_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/asus_rt-n66u_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/79233367619.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/kamafamumegawowidaxato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0875/3315/files/sukerufutuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/sepuwowuximaxog.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/webunexamomefimunolelub.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/36189372048.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_off00007dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD3 4920 bytes
SHA-256: 904078bcd506fae7628f25eca7cd13fd7ddcea97e0c52157f4f9113ba910dabe
font_01_sfnt_off00008e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8D 10824 bytes
SHA-256: be6195e2cfd269cb4290bca8862bfd9d24f8459cbe15cc88f23a7df4481c7da1

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