Malicious PDF — malware analysis report

Static analysis result for SHA-256 c844a3ca2988db38…

MALICIOUS

PDF

32.8 KB Created: 2020-09-05 02:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d9a0a1460a79a684f469920536fd18 SHA-1: 2c0f5b03a7b56165f897aa4514a9ffd4af026ec3 SHA-256: c844a3ca2988db386fc61348e72c94286aab1993f234779fcd30f0f994e0d36e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including a critical redirector link to 'https://ttraff.link/wix?keyword=bryn+mawr+weather+report'. The document body, though heavily obfuscated, also contains this URL and references to 'Bryn mawr weather report', suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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.link/wix?keyword=bryn+mawr+weather+report
    • https://static.usrfiles.com/ugd/5438e3_23fe8108dd7e430583326f2cebf26085.pdf
    • https://static.usrfiles.com/ugd/b8c837_65578ffde2174e11a61e8ae217c79e0e.pdf
    • https://static.usrfiles.com/ugd/5a1791_8df29ca7d56b4db0a30ccd07d0c55cbc.pdf
    • https://static.usrfiles.com/ugd/46429b_f3b81b0cbe3445478bd778c2e8120f76.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/56906016264.pdf
    • https://cdn.shopify.com/s/files/1/0456/4464/4519/files/hcpl_2630_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/72606709680.pdf
    • https://cdn.shopify.com/s/files/1/0433/1103/8632/files/double_sided_business_card_template.pdf
    • https://static.usrfiles.com/ugd/85c99c_08d150100b5e4d0e8e202396e110e012.pdf
    • https://static.usrfiles.com/ugd/6f53d7_2362c7bcba2244c99c188dc265b8fb77.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_off000045c8.bin
03b97f97801d34a030c835f780feacce09bd70fab4b93f7190955724e0c4803d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45C8 5092 bytes
font_01_sfnt_off00005703.bin
642af550ac44c64a544be9948606a7b162088671291580df51067a51998f24b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5703 9352 bytes

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