Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c650f36eb07c9ee…

MALICIOUS

PDF

37.5 KB Created: 2020-08-09 22:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 99a6cb046167dcea99bbb1f7238d1d44 SHA-1: 62b57622369e3ad4ffb02357b9c165a22de86102 SHA-256: 8c650f36eb07c9ee26fd12ccd1076f27198a9fa62a91bfcc7d8aefb14905d1ab
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.ru/pify?keyword=cambridge+igcse+business+studies+coursebook+pdf In PDF document text
    • http://files.rockymtnbernedoodles.com/uploads/1/3/1/3/131380504/5099569.pdfIn PDF document text
    • http://files.coachpbasketball.com/uploads/1/3/1/4/131437530/votem-setixefudaxa-buzejusovez-potuvan.pdfIn PDF document text
    • http://files.retailfanhubnw.com/uploads/1/3/2/3/132303353/wogomabegedaz.pdfIn PDF document text
    • http://files.hungryhawaiian.net/uploads/1/3/2/6/132682848/6939f8188d5.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/1/0435/6666/1791/files/93086764362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/50331746013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/91498659200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/social_media_marketing_strategy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/xovomunevimokog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7776/3226/files/59683637764.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/dotuwikebas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/berliner_mauer_referat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/global_biogeochemical_cycles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/84747649888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/lepilazatelapepemotiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/pujojuxolanarikub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/24995993745.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_off00005326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5326 5552 bytes
SHA-256: 905a9c31a5b9e9b1f9e463f9b3e704095bef3ab9d96838b5ffdaeb8ec106fb48
font_01_sfnt_off000065e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E9 10240 bytes
SHA-256: bd530490141813bc212800e468485b1d9678deb67b48343810fa4a4cc3b044b5

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