Malicious PDF — malware analysis report

Static analysis result for SHA-256 66855c22c52a3105…

MALICIOUS

PDF

40.7 KB Created: 2020-10-15 06:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d787b11a4e170764005080cff1d9791f SHA-1: 6873fe80b4240d891da260b14693c518b20d5035 SHA-256: 66855c22c52a3105298bb5bea876a37e18699aa13881302757cd9af4d7bbd613
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=peptide+synthesis+protocols+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f8714a6dde41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f87612544926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f87a8b68bea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f879acf04a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f87445d33e0e.pdfIn PDF document text
    • https://site-1043794.mozfiles.com/files/1043794/girugudazenizozozibelifed.pdfIn PDF document text
    • https://site-1036985.mozfiles.com/files/1036985/99608313195.pdfIn PDF document text
    • https://site-1042887.mozfiles.com/files/1042887/29729061036.pdfIn PDF document text
    • https://site-1041405.mozfiles.com/files/1041405/97619639179.pdfIn PDF document text
    • https://site-1043699.mozfiles.com/files/1043699/56479916783.pdfIn PDF document text
    • https://site-1037246.mozfiles.com/files/1037246/36756482308.pdfIn PDF document text
    • https://site-1040339.mozfiles.com/files/1040339/59745001388.pdfIn PDF document text
    • https://site-1043809.mozfiles.com/files/1043809/messenger_gratis_para_android_sin_internet.pdfIn PDF document text
    • https://site-1039198.mozfiles.com/files/1039198/3256069031.pdfIn PDF document text
    • https://site-1038908.mozfiles.com/files/1038908/maripixawerupijarujolopo.pdfIn PDF document text
    • https://site-1040984.mozfiles.com/files/1040984/rojigazifusotenosutis.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/1/0479/6402/9095/files/95104392461.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5127/7726/files/duwozifufevenuvadopuruleb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6617/4871/files/pekubefevepakipejabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/3531/9461/files/extreme_landings_apk_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3735/4903/files/parallel_perpendicular_and_transversal_lines_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5424/1694/files/kisaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5484/9952/files/10836698133.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_off000060b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B7 5136 bytes
SHA-256: 099dd8ca6c14996611c059f1d4ab3e184483d7a7c7f243629211fa5d99abf776
font_01_sfnt_off0000722b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x722B 10396 bytes
SHA-256: b136efd9354cadfa6a37e3a4b75ffa41fa6a883b5e04a3c35271722f9ce30398

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