Malicious PDF — malware analysis report

Static analysis result for SHA-256 c838e591366ffb69…

MALICIOUS

PDF

40.0 KB Created: 2020-10-25 04:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 6863f54e67a6f4ffaeaa91f2c848932a SHA-1: b8baff874419787f447b4716a6bb214afd9f757f SHA-256: c838e591366ffb696221c3acfce14f09e75ff9151b37d3afe0986e1d00cd710d
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.link/aws?keyword=coordinate+plane+review+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8851d88e8fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f8899f938a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f9058642c035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f8a33aaf145a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f94d0ef4b188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5f8e4f2d75178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f8987046a86f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f8b30c01420d.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/tinadu.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/binefo.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/2d658bc19458.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005e5d.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005e5d.bin)
    • https://cdn.shopify.com/s/files/1/0499/8361/9232/files/bad_value_proposition_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46526391-0fb1-49ff-adb8-6f5d382f9f40/87708029615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0883e6-6690-4711-8203-a520c55d7b0f/impulz_luts_free_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9792ebf3-a804-4c0d-bf46-517c33407ad3/comprehensive_handbook_obstetrics_an.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8276/0601/files/omron_m2_basic_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/angry_birds_rio_mod_apk_game_download.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_off00005e5d.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5D 5252 bytes
SHA-256: 971a7c7baa4647bb0ef61172dde451ee34fc1274e8f9c596a03b39ad3e4af8eb
font_01_sfnt_off00007043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7043 10140 bytes
SHA-256: 21cb1e0390428e132190741db545b16d987b88478e19897645babbdc8e6116cf