Malicious PDF — malware analysis report

Static analysis result for SHA-256 2523bbf8936d3b97…

MALICIOUS

PDF

39.4 KB Created: 2020-09-20 18:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 11ec715aba895290bec12afe3ef0ef42 SHA-1: c28ba1764d2e0252fcb99fd5ff32056ae7518f1a SHA-256: 2523bbf8936d3b97f3509e7309001697cda3f1c13068b35e1e0ba6638d56a05c
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.com/wix?keyword=super+city+special+edition+apk+ios In PDF document text
    • http://files.mysticaltuscanyretreat.com/uploads/1/3/1/3/131381204/7a0cb8.pdfIn PDF document text
    • http://pawor.jaxburgoyne.com/uploads/1/3/1/8/131856543/nekekofi.pdfIn PDF document text
    • http://fezadut.mjmoments.com.au/uploads/1/3/1/4/131406688/b089fff102.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/1/0438/3683/3952/files/eclipse_java_shortcuts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/74797458632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9027/8568/files/soneturox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/42560834499.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0808/5144/files/dnevni_horoskop_vodic_kroz_zvezde_krstarica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/garud_zep_book_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/japuvive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0604/2023/files/82454850255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7835/2025/files/social_media_marketing_strategy_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/movie_opening_sound_effect_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/gegikafowu.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_off00005c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C63 5336 bytes
SHA-256: cf4cc722c723d2fcb806ab6fb07c0a019bb1353cd22b3d6bd28ebdcaefa36285
font_01_sfnt_off00006e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9F 9996 bytes
SHA-256: d0638d3606d6cab20bf844fc0854184a9eca298c8f99e1227ae132080eae155e

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