Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf90dc5508d5a8d…

MALICIOUS

PDF

42.0 KB Created: 2020-10-25 09:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-02
MD5: ac3f185c7880514deb829960f4dbbe6f SHA-1: 34dff8a55566f987b0a3cbf88ed06f7a8532af14 SHA-256: 8cf90dc5508d5a8d20f93c125ea38a8a8c39a5bd6f4769f816b3832de1cc11ad
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.me/aws?keyword=avery+template+8366+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f89ae4ecb98d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5f9295e340bb5.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/16986831e0.pdfIn PDF document text
    • https://kitujimozudek.weebly.com/uploads/1/3/4/3/134375735/guwezaloxof.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/nutila.pdfIn PDF document text
    • https://jomunibudax.weebly.com/uploads/1/3/4/3/134342604/6861763.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/regopomasopugaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5f923bc06e5cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5f932c08c1b11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f8f1357ce178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5f8c91d7c4b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f8775ae0db4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f8e32c1bed73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5f9056c456552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5f906110bd04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f90d917df287.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000636a.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000636a.bin)
    • https://cdn.shopify.com/s/files/1/0434/5744/6041/files/wexewefanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0599/5940/files/kings_and_knights_etc_crossword.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6423/6481/files/witojegomewew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/96232755257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7607/3125/files/vibiwewawawimoga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/fuzafufigelaseno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9829/0856/files/roger_wardell_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8888/0821/files/2406824113.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_off0000636a.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000636a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 5672 bytes
SHA-256: 00ee1d5fb723f640c168de6bae712fc67fe59cf3306350db2eccb9d627472189
font_01_sfnt_off000076b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B7 10672 bytes
SHA-256: ba47292aeb1d2371933d7ee5fc5a69389df3d6e613839de2b35e6f5025efffec