Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dbdb47e9959da6…

MALICIOUS

PDF

110.7 KB Created: 2020-09-19 01:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 658fae672e77a5ececdd44da0e745110 SHA-1: e03a9e765b40a7a3bf039c9efd50d0953804fd64 SHA-256: 10dbdb47e9959da68b956b2987ea73ef0103b5101a5899fcdd274c0b816ebfdc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wb?keyword=cheek%20cell%20under%20microscope%2040x
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8e697c79-cf57-4cb6-8caa-ecf95b27970e.filesusr.com/ugd/46bfb0_8d0ece4b32194a668cf88527c70a8bc7.pdf?index=true
    • https://141d9d7a-b7fd-4bbe-bdec-4cfb94835e07.filesusr.com/ugd/724fb5_4edbf052e2fe44efb011da85d7c5239f.pdf?index=true
    • https://b15408c5-72a6-4dbd-a645-fffcd57df6b5.filesusr.com/ugd/8c0e65_bba401b59a5d471aa9fbe4f1be5c530d.pdf?index=true
    • https://30be3782-0a11-4e3b-b054-6af93754084c.filesusr.com/ugd/ce77c6_d132f52a76ea4609bf5cb8ba2d393374.pdf?index=true
    • https://78004642-553f-48e4-9934-8c83102ec885.filesusr.com/ugd/83b1b3_6875693600f74bc2b0182dfb668ed06d.pdf?index=true
    • https://56f0689c-6c00-47bc-8b4d-88dee34fd618.filesusr.com/ugd/704f6c_c4e2d50e95da47dd827d1f2dff9df7a1.pdf?index=true
    • https://5a4df692-7563-467e-a961-466a41550669.filesusr.com/ugd/f0b6b3_63743e61ce4947c2bc633d4764877f42.pdf?index=true
    • https://7bc2b5b9-020c-4141-b3ce-203f01763781.filesusr.com/ugd/575363_c8fcbd53f2814c4b88cec1e8c8b012af.pdf?index=true
    • https://f7651bc1-d9f6-4f72-842d-9cb17e41f262.filesusr.com/ugd/2f7489_51b6c53a6c884835a0f16dc473c3490c.pdf?index=true
    • https://71fb4cad-1631-4fa0-a2da-1c1aac79843c.filesusr.com/ugd/704988_ef69ad9ec61c43c1a217c7b43b867b1a.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0440/2960/8101/files/67754873756.pdf
    • https://cdn.shopify.com/s/files/1/0469/5126/8513/files/dezitixulefewupumif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017639.bin
fa4a2d12366585186b338785a813bc0cfac3636f84fd651343330b4dd2ff605b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17639 5368 bytes
font_01_sfnt_off0001885a.bin
6de4a7114cdcc8642f54ef29fa36aa00b8d82d03dbc1605dbdfa72d9e2a3cfa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1885A 10960 bytes

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