Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d8be418025c8ed…

MALICIOUS

PDF

41.6 KB Created: 2020-09-03 03:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ede21c93d85587c946ed79184464951d SHA-1: fa59625d3a8748e5d164ab39b7d564a79c4ecda1 SHA-256: 20d8be418025c8ed4da88818597570722d1e029271ce78479e20f287f32a4a7f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.com/pify?keyword=candy+crush++for+pc+windows+10'. This indicates a social engineering attack aiming to trick users into visiting a potentially harmful site. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=candy+crush++for+pc+windows+10
    • https://static.usrfiles.com/ugd/34e21e_0b9d7f8afc5248088237326096833e73.pdf
    • https://static.usrfiles.com/ugd/aef5b7_f0823a9d718b4772b7c9e0865a59fa7e.pdf
    • https://static.usrfiles.com/ugd/9cc572_ce78eb83a6a340ceb6f1cc5b7fbdfc86.pdf
    • https://static.usrfiles.com/ugd/b8c837_a25d2ea2402347baa32c25210f26d2f1.pdf
    • https://static.usrfiles.com/ugd/1479de_7239ee1412a049a3ba787fda29bd1ba7.pdf
    • https://cdn.shopify.com/s/files/1/0432/6693/2902/files/menixasozepubi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/95990599376.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/phonics_activity_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/4039/8750/files/48985858736.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/bulliform_cells_are_present_in.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006371.bin
3458c547ab3f4476bb4a99622075e39545251af62d13f5788f36a39f53b7c29d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6371 5504 bytes
font_01_sfnt_off00007644.bin
e008afdef3d357e8fd8816836084805696cc3220900e89e2f0f938d8e2491c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7644 10476 bytes

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