Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd91ef123d47e34f…

MALICIOUS

PDF

41.0 KB Created: 2020-09-18 07:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1987d10f70bd5aa993e23754c348bd4b SHA-1: 20ff4b0a3608c40fb318f7b676da19307f3c074c SHA-256: fd91ef123d47e34f0bd6ee073fc2a836bb5719bacebd902e8750a9df316c246e
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or redirection attempt. The document body, though partially corrupted, contains text related to 'Leeds primary school admissions 2020' and the malicious URL, indicating a lure. The presence of multiple embedded PDF links further supports the 'link farm' heuristic, designed to drive traffic to external sites. No scripts were extracted, but the overall structure and heuristics point to a malicious redirection campaign.

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=leeds+primary+school+admissions+2020
    • http://files.communityprojectsnapa.com/uploads/1/3/1/4/131483281/nexuwuxugot.pdf
    • http://files.nestmboston.com/uploads/1/3/1/3/131398177/vusogolexebozu-xivekizoxaxom-basisidexijum-gujas.pdf
    • http://files.anglersarsenaltx.com/uploads/1/3/1/8/131871725/9375144.pdf
    • https://7f690653-2683-40db-9f01-c31f255e8f62.filesusr.com/ugd/3eed2b_590314d67281490e8f2ca728828d9d95.pdf?index=true
    • https://e8fb7792-f7f6-412e-866b-db4a08af8cbc.filesusr.com/ugd/ce14f3_fe349f1a0aac40bfa34b369e88ac2d7a.pdf?index=true
    • https://c28fb291-7a9f-4b44-978e-8e7a36450a77.filesusr.com/ugd/035627_60b3acb8c6674d0494febe036978ba1f.pdf?index=true
    • https://ed93c9ee-52a0-4954-9a27-3c7f1b7110a9.filesusr.com/ugd/77941b_09d18ca56b9b499fafb05481058586e3.pdf?index=true
    • https://f2ec1542-b38f-403c-ad7b-ef7e30255500.filesusr.com/ugd/cafc24_7f8d9ee308114a40ab5d43e85451800c.pdf?index=true
    • https://e846de8e-0d54-4cfc-b0f7-492ccdff7172.filesusr.com/ugd/f91cf1_1f948289f7be46b68087b88fa688bc42.pdf?index=true
    • https://ef661985-6abe-4cb9-8f96-80e1cd3f9607.filesusr.com/ugd/110ef3_b5ff4a62797944799798d875df6edb8a.pdf?index=true
    • https://c22c4194-b60e-4046-bbb5-9e91c83afe8d.filesusr.com/ugd/f08e01_f06a92e17dfe4641a8e76c782157ba12.pdf?index=true
    • https://90a6c943-744c-4c49-bbd6-7defa0ed0cea.filesusr.com/ugd/9b7d8a_dcbe220d1eb047169a4ee599d3a6e224.pdf?index=true
    • https://0d7a40ec-4555-4518-be73-57b00df46b3f.filesusr.com/ugd/93c935_28aa7ab78be146ad993a8a84b9eba628.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005425.bin
11c8d058b500a53e98f620805cc8699e6aabde8aa1f82b4d267752e7d51b0be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5425 5336 bytes
font_01_sfnt_off0000661e.bin
e27ae602766c7426636ae46dc357fa1a6e41cef51f359202a6fb50b5022ac229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661E 10224 bytes
font_02_sfnt_off0000890e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890E 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.