Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6b774d85a5a755…

MALICIOUS

PDF

48.4 KB Created: 2020-10-15 06:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: bb7f6e0f0356f98a194d98a7037589f2 SHA-1: e1ae2e6f3604e4c476f5cc132dcf873ccfe5a9cf SHA-256: aa6b774d85a5a755a58e84405272fd5d088115317c504193102515bd494d3c31
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/123?keyword=la+chartreuse+de+parme+edition+gf+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f87680ccb20b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f87351d1d150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f87c580de02e.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://uploads.strikinglycdn.com/files/eda4c9c3-e6c6-4912-9072-cf458a99dc06/84465532198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a16a9a0-02a9-4fe3-ba84-f185763b9601/nubupurato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7775f3a8-3c09-4f14-9ad4-e0086435139d/lumepadowagujexozakegik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425e9955-d50e-444a-a63f-35530f4a5e5d/26678138402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9425d618-2392-4df3-a781-e1b47fc977e7/joxijeparukojipemosik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae55634-2021-466d-9c17-3b751bf6bb5b/fawewokabeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c552568e-a7a4-42b2-a11f-a2b003a0d4e1/85491118664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b193983-a3c1-4c96-abbd-83dbbcde2416/furojubaxafexuxajigedesig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09bdab2a-52d4-462f-ba92-37247f8b53fa/lezigeziwekuzomajotugow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbdc0a2-abc7-4432-b2bf-6385982f3658/repagikozaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf19cec-f8e0-4b00-837c-9dee23fd5ca8/95712334862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/qualitative_and_quantitative_data_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4789/0329/files/99760653109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5088/4008/files/metal_cutting_and_machine_tools_lab_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/uncharted_waters_online_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1503/9908/files/6809613845.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_off00006e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E20 5360 bytes
SHA-256: 7b72072e8fd53580e974138df75038dfb55442d793de1642a91187ff4720f318
font_01_sfnt_off00008038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8038 11992 bytes
SHA-256: d21214441d7a5c1967f798a4ebc33c3f7328e3d6b3b1a1c34d257fbea63fd428
font_02_sfnt_off0000a5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c