Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b853a1f5bffeff…

MALICIOUS

PDF

39.5 KB Created: 2020-11-01 03:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 78c490e5dd25ff14a463a61811a84719 SHA-1: 6d3cf7ef00b4bf27be3b78dbe34c40d17e4b5a16 SHA-256: b1b853a1f5bffeff030d43e223133d5d08262b617d74bff18dbf2362da307899
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://cctraff.ru/aws?keyword=soa+exam+fm+study+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f894f08ca261.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005a30.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005a30.bin)
    • https://cdn.shopify.com/s/files/1/0502/6706/2464/files/pewdiepies_tuber_simulator_apk_1.55.0.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/nisin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/1776/2465/files/64740873157.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/jivepiditubi.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/panasonic_microwave_inverter_turbo_defrost.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/catalogo_bticino_2010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9095/0338/files/22771781901.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/the_book_of_lost_things_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/initial_consonant_blends.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7008/6051/files/mitalumudet.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 extracted file (font_00_sfnt_off00005a30.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A30 5232 bytes
SHA-256: 868ed76b81e96c95fd1992c2ef104e6086424fd2e7d2ba54a12e01f5cf194c15
font_01_sfnt_off00006bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFF 11124 bytes
SHA-256: 4c9788ad2d1248d63e4d23f742e63ce99f31c59dbbffca7a087055da23a5ec21