Malicious PDF — malware analysis report

Static analysis result for SHA-256 1676d208912f1708…

MALICIOUS

PDF

41.2 KB Created: 2020-10-01 01:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 88f26986ae6a3198a11d9c4337898448 SHA-1: fa38dd5de2eef21683b911bb2a0a3d29820420f1 SHA-256: 1676d208912f170881399eda2d8e15de84ff42ead27c0f53846564fbfbe6d2be
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://ggtraff.ru/strik?keyword=algebra+tiles+workbook+pdf In PDF document text
    • http://bidobuxus.peterandpaulapixie.com/uploads/1/3/1/4/131454215/kuduj-lumataw-wenuxewud-bofixev.pdfIn PDF document text
    • https://site-1038375.mozfiles.com/files/1038375/16437061.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/xavubinen.pdfIn PDF document text
    • https://site-1036864.mozfiles.com/files/1036864/68915280672.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/1/0432/5860/9819/files/brooklyn_nine_nine_season_5_episode_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5029/4687/files/memorable_night_quotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1466/5878/files/tabikarunejerijazi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/xezekazonixoxirub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/pdf_sample_file_adobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ba0d63-d283-48ed-bdf3-d50d9cb510bb/likusamezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27da8716-8ee6-44c3-92c6-eaa1930aabbe/22434838780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad0a218-3280-4151-8666-f1e2c4c73176/62171371392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5738beb-677a-4947-a15e-d399efd284e6/tugofagepesunotaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f7de06-473d-490e-b0c6-e80af9a09648/tuwubamijupibofuvi.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_off00006189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6189 5492 bytes
SHA-256: f48004fbfe4d39c495f9bb9f7b94ac62c1d8f303d7d11b856472da0a80e7ed2e
font_01_sfnt_off0000745a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745A 10468 bytes
SHA-256: 7cb7358d3dbe5fadda19ec53ad8e389ad3910447266dc88b7de6274b881a5be1

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