Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b76139a5ed7be2…

MALICIOUS

PDF

51.2 KB Created: 2020-08-26 22:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 59e01030c416c1385c5c898aecc596ed SHA-1: 217d1deadb34a9c5d5201ba9a49ddb6910db5fc6 SHA-256: 86b76139a5ed7be2ee2cc2713b7efbb1d0c35cab8e286ebc98b40d14b72663c1
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/pify?keyword=dubai+sex+guide In PDF document text
    • http://files.thepocketpod.com/uploads/1/3/0/7/130775528/limezexaxotorimip.pdfIn PDF document text
    • http://files.countrypineslincoln.com/uploads/1/3/1/4/131453605/1bdc51bcfe.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/1/0433/9479/3635/files/chemistry_notes_for_class_11_chapter_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/venojolevozikepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3255/9267/files/70562836362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/ruvenasajetagabotur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3150/9664/files/95199808533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2494/9153/files/15360863831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/arnie_the_doughnut_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7616/4515/files/p_square_beautiful_onyiye.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a28f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA28F 18820 bytes
SHA-256: 75506da18f2d3db4c7781e25bd14f2b59af89c2883931de317097a6d28f7ec6b
font_00_sfnt_off00006df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF9 5072 bytes
SHA-256: 8359d2193522c69b044c76f3e4138f096cb0783d06a7aca19bdc583ed250f281
font_01_sfnt_off00007f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4B 10240 bytes
SHA-256: 006ddacb8be5caaa80d700156e87cf45dca09b4ea4457d6909b90ede14a77eca