Malicious PDF — malware analysis report

Static analysis result for SHA-256 171879a91b9236bc…

MALICIOUS

PDF

48.0 KB Created: 2020-09-12 06:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: c9364e83a63102346b223df3ab7c1571 SHA-1: 1337a9e0bba1a2ef4872c75bf2aa34fc40efcf98 SHA-256: 171879a91b9236bcc9b1c7b3307cb7d2ea5441283b1c0ce2ddbe64e438a28188
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.club/pify?keyword=spreadsheet+compare+tool+for+excel+2013 In PDF document text
    • http://files.thewellnysstree.com/uploads/1/3/1/3/131384300/votasafenoxuwe.pdfIn PDF document text
    • http://files.theartboxstudio.com/uploads/1/3/0/8/130813395/f54459d44ba0a6.pdfIn PDF document text
    • http://files.petekelsall.com/uploads/1/3/0/9/130969835/1b3347427d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4016/9374/files/clasificacion_de_los_animales_segun_su_nacimiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5264/6050/files/ornamental_fish_farming_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1026/8068/files/pigusovaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kixekitigatozodevejale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2082/8315/files/zanupofakitigo.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70a38d_6caeef46b6b84d1cb87ca3de8026402a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/48bf55_e26ebf98961b43f2a2fcc2dbdc4be311.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e7e4a0_1a93ae3efb584db6aa795dda051ab96a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/681527_a66e5fa9889e460ca8132e048658fa57.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E03 5688 bytes
SHA-256: 0808257b6616bafabcef09c98347d4c51419ee9d4e092d9043e7e3a8ce0f36ac
font_01_sfnt_off0000816a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x816A 10420 bytes
SHA-256: a061eae377428f5e0074c727f73445fed829486d239a44dffd3f93e52da25316
font_02_sfnt_off0000a51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA51A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333